UFC says ex-champ Anderson Silva tests positive for steroids

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LOS ANGELES (AP) -- Former UFC middleweight champion Anderson Silva has tested positive for steroid use.

Silva, the 39-year-old Brazilian widely considered the greatest mixed martial artist in the young sport's history, tested positive for Drostanolone metabolites and another steroid in an out-of-competition test Jan. 9.

Nick Diaz, his opponent at UFC 183 last Saturday, also tested positive for elevated levels of marijuana metabolites in results released Tuesday night by the Nevada Athletic Commission.

The UFC said the commission is doing further testing to confirm the results, but the stunning announcement casts a large shadow over Silva's impressive comeback from a badly broken leg last Saturday for a unanimous-decision victory over Diaz.

In a brief statement, the UFC said it was "disappointed to learn of these initial results."

"Anderson Silva has been an amazing champion and a true ambassador of the sport of mixed martial arts and the UFC, in Brazil as well as around the world," the UFC's statement added. "The UFC has a strict, consistent policy against the use of any illegal and/or performance-enhancing drugs, stimulants or masking agents by its athletes."

Silva (34-6) beat Diaz by a wide decision last weekend in Las Vegas, winning every round on two of the three judges' scorecards. The fight was a triumphant return to the cage for Silva, who broke his lower left leg 13 months ago.

UFC 183: Silva v Diaz
UFC President Dana White is among those who have proclaimed Silva to be the sport's greatest fighter. He won 10 consecutive title defenses over seven years as the UFC's 185-pound champion, most of them showcasing his incredible athleticism and striking skills, until losing the belt to Chris Weidman in July 2013 and breaking his leg in their rematch.

Yahoo Sports first reported Silva's failed test and Diaz's latest failed marijuana test. Silva and Diaz will face a disciplinary hearing before the Nevada commission on Feb. 17, and their licenses to fight likely will be suspended.

Silva has never publicly failed a drug test in his MMA career, but could face a nine-month suspension for a first offense.

Diaz tested positive for marijuana use twice already in his career, in 2007 and 2012, and could face a lengthy suspension. He returned from a self-imposed 22-month absence to take on Silva for a lucrative payday.

In another statement, the UFC said it will "fully respect" the Nevada commission's suspension decision, noting that Diaz has violated the UFC's fighter conduct policy and his promotional agreement.

Silva's manager, Ed Soares, didn't immediately return a request for comment.

Immediately after his victory last weekend, Silva said he hadn't decided whether to retire from the sport. He planned to consult with his wife and five children before determining his future.

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Anderson Silva, Nick Diaz UFC 183
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UFC says ex-champ Anderson Silva tests positive for steroids
LAS VEGAS, NV - JANUARY 31: Overhead view of the Octagon (R-L) Anderson Silva and Nick Diaz exchange punches in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Anderson Silva walks to the Octagon to face Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Anderson Silva waits for the start of a middleweight fight against Nick Diaz during UFC 183 at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. Silva won by unanimous decision. (Photo by Steve Marcus/Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Anderson Silva and Nick Diaz touch gloves before their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Anderson Silva of Brazil and Nick Diaz trade punches in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Anderson Silva of Brazil battles Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Nick Diaz is treated in his corner between rounds of his middleweight bout against Anderson Silva of Brazil during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Nick Diaz taunts Anderson Silva of Brazil in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Nick Diaz punches Anderson Silva of Brazil in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Nick Diaz punches Anderson Silva of Brazil in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Nick Diaz punches Anderson Silva of Brazil in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Nick Diaz punches Anderson Silva of Brazil in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Nick Diaz punches Anderson Silva of Brazil in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Nick Diaz punches Anderson Silva of Brazil in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Nick Diaz punches Anderson Silva of Brazil in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Anderson Silva of Brazil kicks Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Nick Diaz punches Anderson Silva of Brazil in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Anderson Silva of Brazil punches Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Anderson Silva of Brazil punches Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Anderson Silva of Brazil punches Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Anderson Silva of Brazil punches Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Anderson Silva of Brazil punches Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Anderson Silva of Brazil punches Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Anderson Silva of Brazil punches Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Anderson Silva of Brazil delivers a flying knee against Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Nick Diaz battles Anderson Silva in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Anderson Silva of Brazil battles Nick Diaz (not pictured) in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Anderson Silva of Brazil battles Nick Diaz (not pictured) in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Nick Diaz battles Anderson Silva (not pictured) in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Nick Diaz battles Anderson Silva (not pictured) in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Nick Diaz battles Anderson Silva (not pictured) in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Nick Diaz and Anderson Silva fight in their middleweight bout during UFC 183 at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. Silva won by unanimous decision. (Photo by Steve Marcus/Getty Images)
LAS VEGAS, NV - JANUARY 31: Nick Diaz (L) takes a kick from Anderson Silva in a middleweight bout during UFC 183 at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. Silva won by unanimous decision. (Photo by Steve Marcus/Getty Images)
LAS VEGAS, NV - JANUARY 31: Anderson Silva falls to the mat after being declared the winner over Nick Diaz (L) in a middleweight bout during UFC 183 at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. Silva won by unanimous decision. (Photo by Steve Marcus/Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Nick Diaz punches Anderson Silva in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Anderson Silva (L) kicks Nick Diaz in their middleweight bout during UFC 183 at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. Silva won by unanimous decision. (Photo by Steve Marcus/Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Anderson Silva punches Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Anderson Silva reacts to his victory over Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Anderson Silva kicks Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Anderson Silva punches Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Anderson Silva kicks Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Nick Diaz punches Anderson Silva in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Anderson Silva punches Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Nick Diaz kicks Anderson Silva in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Nick Diaz punches Anderson Silva in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Anderson Silva reacts to his victory over Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Anderson Silva kicks Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Anderson Silva punches Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (L-R) Anderson Silva punches Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Anderson Silva punches Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Nick Diaz punches Anderson Silva in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Anderson Silva punches Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NEVADA - JANUARY 31: Anderson Silva of Brazil celebrates after his unanimous-decision victory over Nick Diaz in their middleweight fight during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Anderson Silva of Brazil celebrates after his unanimous-decision victory over Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NEVADA - JANUARY 31: Anderson Silva of Brazil celebrates after his unanimous-decision victory over Nick Diaz in their middleweight fight during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Nick Diaz congratulates Anderson Silva of Brazil after Silva defeated Diaz by unanimous decision in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: (R-L) Anderson Silva of Brazil is interviewed by Joe Rogan after his unanimous-decision victory over Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Anderson Silva reacts to his victory over Nick Diaz in their middleweight bout during the UFC 183 event at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - JANUARY 31: Nick Diaz leaves the arena after losing to Anderson Silva in a middleweight bout during UFC 183 at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. Silva won by unanimous decision. (Photo by Steve Marcus/Getty Images)
LAS VEGAS, NV - JANUARY 31: Anderson Silva leaves the arena after beating Nick Diaz in a middleweight bout during UFC 183 at the MGM Grand Garden Arena on January 31, 2015 in Las Vegas, Nevada. Silva won by unanimous decision. (Photo by Steve Marcus/Getty Images)
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