Matthew Perry says past substance abuse has caused him to forget 'three years' of 'Friends'

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Matthew Perry Doesn't Remember 3 Years of 'Friends' Because of Addiction

While playing the role of a lifetime, Matthew Perry was battling addiction.

During a recent interview on BBC Radio 2 in Britain, the 46-year-old actor found himself unable to recall his least favorite episode of Friends due to his admitted substance abuse at the time.

"I think the answer is I don't remember three years of it," he candidly admitted. "So none of those... somewhere between season three and six."

MORE: 'Friends' Cast Reunites to the Delight of Kaley Cuoco: 'I Died and Went to Heaven'

See the cast through the years:

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Matthew Perry says past substance abuse has caused him to forget 'three years' of 'Friends'
FRIENDS -- Season 6 -- Pictured: (l-r) David Schwimmer as Ross Geller, Jennifer Aniston as Rachel Green, Courteney Cox as Monica Geller, Matthew Perry as Chandler Bing, Lisa Kudrow as Phoebe Buffay, Matt LeBlanc as Joey Tribbiani -- (Photo by: NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- Season 10 -- Pictured: Courteney Cox as Monica Geller, Matt LeBlanc as Joey Tribbiani, Lisa Kudrow as Phoebe Buffay, Matthew Perry as Chandler Bing, Jennifer Aniston as Rachel Green, David Schwimmer as Dr. Ross Geller (Photo by NBC/NBCU Photo Bank via Getty Images)
FRIENDS - 'The One With The Engagement Picture' -- Episode 5 -- Aired 11/2/2000 -- Pictured (l-r): Lisa Kudrow as Phoebe Buffay, Jennifer Aniston as Rachel Green, Matthew Perry as Chandler Bing -- NBCU Photo Bank
This photo released by Warner Bros shows the cast of "Friends" from the final episode which wil air May 6, 2004 on NBC. It was taken in Burbank, Calif, Friday, Jan. 23, 2004. From left are Jennifer Aniston as Rachel, Matt LeBlanc as Joey, David Schwimmer as Ross, Lisa Kudrow as Phoebe, Matthew Perry as Chandler and Courteney Cox Arquette as Monica. (AP Photo/Danny Feld, Warner Bros)
The cast of television's "Friends", from left: Matt LeBlanc, Matthew Perry, Lisa Kudrow, Courteney Cox Arquette, Jennifer Aniston and David Schwimmer appear during the 54th Annual Primetime Emmy Awards Sunday, Sept. 22, 2002, at the Shrine Auditorium in Los Angeles. (AP Photo/Kevork Djansezian)
The cast members of the television show "Friends" arrive at New York's Rockefeller Center for NBC's 75th Anniversary event Sunday May 5, 2002. From left: Matthew Perry, Courteney Cox Arquettte, David Schwimmer, Jennifer Aniston and Matt LeBlanc. (AP Photo/Tina Fineberg)
FRIENDS -- Season 6 -- Pictured: (l-r) David Schwimmer as Ross Geller, Jennifer Aniston as Rachel Green, Courteney Cox as Monica Geller, Matthew Perry as Chandler Bing, Lisa Kudrow as Phoebe Buffay, Matt LeBlanc as Joey Tribbiani -- (Photo by: NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- 'The One with the Fake Monica' Episode 21 -- Pictured: (l-r) Lisa Kudrow as Phoebe Buffay, Matt LeBlanc as Joey Tribbiani, Jennifer Aniston as Rachel Green, David Schwimmer as Ross Geller, Matthew Perry as Chandler Bing, Courteney Cox Arquette as Monica Geller (Photo by NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- Pictured: (l-r) Jennifer Aniston as Rachel Green, David Schwimmer as Ross Geller, Matthew Perry as Chandler Bing, Lisa Kudrow as Phoebe Buffay, Courteney Cox Arquette as Monica Geller, Matt LeBlanc as Joey Tribbiani (Photo by Andrew Eccles/NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- 'The One After 'I Do' -- Episode 1 -- Aired 09/27/2001 -- Pictured: (l-r) Lisa Kudrow as Phoebe Buffay, Courteney Cox as Monica Geller-Bing, Jennifer Aniston as Rachel Green-- Photo by: Danny Feld/NBCU Photo Bank
FRIENDS -- 'The One With The Christmas In Tulsa' -- Episode 10 -- Aired 12/12/2002 -- Pictured: (l-r) Matt LeBlanc as Joey Tribbiani, Courteney Cox-Arquette as Monica Geller Bing, Lisa Kudrow Phoebe Buffay, David Schwimmer as Ross Geller, Jennifer Aniston as Rachel Green -- Photo by: NBCU Photo Bank
FRIENDS -- 'The One Where the Stripper Cries' -- Episode 11 -- Aired 2/5/2004 -- Pictured: (l-r) Courteney Cox Arquette as Monica, Jennifer Aniston as Rachel, Matthew Perry as Chandler -- Photo by: NBCU Photo Bank
FRIENDS -- 'The One With The Boob Job' -- Epsiode 16 -- Aired 2/20/2003 -- Pictured: (l-r) Matt LeBlanc as Joey Tribbiani, Jennifer Aniston as Rachel Green, Courteney Cox-Arquette as Monica Geller Bing, Matthew Perry as Chandler Bing -- Warner Bros. Photo
FRIENDS -- 'The One With Monica And Chandler's Wedding' -- Episode 24 -- Aired 5/17/2001 -- Pictured: (l-r) Lisa Kudrow as Phoebe Buffay, Courteney Cox as Monica Geller-Bing, Matthew Perry as Chandler Bing, Jennifer Aniston as Rachel Green -- Photo by: Danny Feld/NBCU Photo Bank
FRIENDS -- 'The One With The Embryos' -- Episode 12 -- Aired 1/15/1998 -- Pictured: (l-r) Matt Le Blanc as Joey Tribbiani, Matthew Perry as Chandler Bing, Jennifer Aniston as Rachel Green, Courteney Cox as Monica Geller (Photo by NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- Season 2 -- Pictured: (l-r) Matthew Perry as Chandler Bing, Jennifer Aniston as Rachel Green, David Schwimmer as Ross Geller, Courteney Cox as Monica Geller, Matt LeBlanc as Joey Tribbiani, Lisa Kudrow as Phoebe Buffay (Photo by NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- 'The One with the Embryos' Episode 12 -- Pictured: (l-r) Jennifer Aniston as Rachel Green, Courteney Cox as Monica Geller, Matthew Perry as Chandler Bing (Photo by J. Delvalle/NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- 'The One That Could Have Been: Part 1, 2' Episode 15, 16 -- Pictured: (l-r) Courteney Cox as Monica Geller, Matt LeBlanc as Joey Tribbiani, Jennifer Aniston as Rachel Green (Photo by Chris Haston/NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- 'The One with the Embryos' Episode 12 -- Pictured: (l-r) Matthew Perry as Chandler Bing, Matt LeBlanc as Joey Tribbiani, Courteney Cox as Monica Geller, David Schwimmer as Ross Geller, Debra Jo Rupp as Alice Knight Buffay, Jennifer Aniston as Rachel Green, Giovanni Ribisi as Frank Buffay Jr., Lisa Kudrow as Phoebe Buffay (Photo by J. Delvalle/NBC/NBCU Photo Bank via Getty Images)
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This is not the first time Perry has opened up about his struggles with Vicodin and alcohol. In August, the actor gave a very candid interview with the Hollywood Reporter, where he explained, "You can't have a drug problem for 30 years and then expect to have it be solved in 28 days," adding, "Getting sober is a really hard thing to do."

In 2013, Perry -- who has been to rehab twice -- turned his former Malibu home into a sober living facility called Perry House.

WATCH: Matt LeBlanc and Lisa Kudrow Have a Super Sweet Friends Reunion at the 2015 Emmys

Meanwhile, the cast of Friends just celebrated a mini-reunion!

With the exception of Perry, whose rep told ET that he couldn't join due to a scheduling conflict -- the actor is currently preparing for his upcoming play, The End of Longing -- the whole gang got together over the weekend to participate in a tribute broadcast honoring legendary TV director James Burrows. It marked one of the rare appearances of our favorite Friends ever reuniting since the show went off the air in 2004.

Watch the video below:

A 'Friends' Reunion Is Actually Happening But There's a Catch!
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