Kim Basinger, Eric Johnson and Bella Heathcote have also recently joined the cast, with Dakota Johnson and Jamie Dornan returning to reprise their roles of Anastasia Steele and Grey, respectively. James Foley is taking over directing reins from Sam Taylor-Johnson.
Dancy will play Dr. Flynn, Grey's psychiatrist in the books.
Luke Grimes, Eloise Mumford and Max Martini are also returning to the cast, with Michael De Luca and Dana Brunetti producing along with author E.L. James and Marcus Viscidi. Niall Leonard and James are penning the script.
See photos of Dancy:
Hugh Dancy Joins 'Fifty Shades Darker'
Actress Claire Danes and her husband actor Hugh Dancy arrive at the 67th Primetime Emmy Awards in Los Angeles, California September 20, 2015. REUTERS/Mario Anzuoni
British actor Hugh Dancy from the NBC series "Hannibal" takes part in a panel discussion at the NBC portion of the 2014 Winter Press Tour for the Television Critics Association (TCA) in Pasadena, California, January 19, 2014. REUTERS/Gus Ruelas (UNITED STATES - Tags: ENTERTAINMENT HEADSHOT)
Cast member Hugh Dancy poses at the gala presentation for the film "Hysteria" at the 36th Toronto International Film Festival September 15, 2011. REUTERS/Mike Cassese (CANADA - Tags: ENTERTAINMENT)
Cast member Hugh Dancy smiles during the news conference for the film "Hysteria" during the 36th Toronto International Film Festival (TIFF) September 15, 2011. REUTERS/Mark Blinch (CANADA - Tags: ENTERTAINMENT HEADSHOT)
NEW YORK, NEW YORK - MARCH 24: Hugh Dancy attends the New York Live Arts 2016 Gala at the Museum of Jewish Heritage on March 24, 2016 in New York City. (Photo by D Dipasupil/FilmMagic)
HOLLYWOOD, CA - MARCH 21: Actor Hugh Dancy arrives at the Premiere Of Hulu's 'The Path' at ArcLight Hollywood on March 21, 2016 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
LOS ANGELES, CA - JANUARY 06: Actors Hugh Dancy (L) and Claire Danes attend the People's Choice Awards 2016 at Microsoft Theater on January 6, 2016 in Los Angeles, California. (Photo by C Flanigan/WireImage)
NEW YORK, NY - OCTOBER 02: Actor Hugh Dancy attends the BAFTA New York & The Cinema Society With FIJI Water & St-Germain party for the New York Film Festival at PH-D Terrace at Dream Midtown on October 2, 2015 in New York City. (Photo by Dimitrios Kambouris/Getty Images)
LOS ANGELES, CA - SEPTEMBER 20: Actors Claire Danes and Hugh Dancy arrive at the 67th Annual Primetime Emmy Awards at Microsoft Theater on September 20, 2015 in Los Angeles, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
NEW YORK, NY - JUNE 09: Actor Hugh Dancy attends Apple Store Soho Presents: Meet the Actor: Hugh Dancy, 'Hannibal' at Apple Store Soho on June 9, 2015 in New York City. (Photo by Ilya S. Savenok/Getty Images)
LOS ANGELES, CA - AUGUST 25: (L-R) Claire Danes and Hugh Dancy arrive at the FOX, 20th Century FOX Television, FX Networks and National Geographic Channel's 2014 Emmy Award Nominee Celebration at Vibiana on August 25, 2014 in Los Angeles, California. (Photo by Jennifer Lourie/FilmMagic)
NEW YORK, NY - MAY 12: Actor Hugh Dancy from 'Hannibal' attends the 2014 NBC Upfront Presentation at The Jacob K. Javits Convention Center on May 12, 2014 in New York City. (Photo by Jim Spellman/WireImage)
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Universal is planning to shoot "Fifty Shades Darker" and the final pic, "Fifty Shades Freed," back-to-back, with "Darker" set to bow Feb. 10, 2017. "Darker" is currently in production.
Dancy currently stars on Hulu's drama "The Path" with Aaron Paul and Michelle Monaghan. He previously starred on NBC's "Hannibal" and he was nominated for an Emmy for his playing the Earl of Essex in HBO's miniseries "Elizabeth I."
He's repped by UTA, United Agents, Parseghian Planco and Jackoway Tyerman. The Hollywood Reporter first reported the news.