Daniel Cudmore, Fan Bingbing and Boo Boo Stewart will appear in 20th Century Fox's next instalment in the franchise.
Director Bryan Singer posted a picture of a wall in the production office with photographs of the new and previously confirmed cast members on Twitter.
Cudmore will reprise his role as Colossus from X2 and X-Men: The Last Stand.
Bingbing is expected to take on the role of mutant teleporter Blink. The comic book character was killed soon after her introduction only for her alternate 'Age of Apocalypse' incarnation to become a fan favourite.
It is unknown what role Twilight actor Boo Boo Stewart will fill.
James McAvoy, Michael Fassbender, Nicholas Hoult, Sir Patrick Stewart, Sir Ian McKellen, Anna Paquin, Ellen Page, Shawn Ashmore, Omar Sy, Hugh Jackman, Jennifer Lawrence, Halle Berry and Peter Dinklage have already been cast in the film.
X-Men: Days of Future Past will arrive in cinemas on July 18, 2014.
Watch Bryan Singer and James McAvoy discuss X-Men: Days of Future Past with Digital Spy below: