Peter Dinklage

By Stephanie Goldberg, (CNN) — Peter Dinklage is joining the cast of “X-Men: Days of Future Past.”

Director Bryan Singer announced the news via Twitter on Wednesday, writing, “Officially like to welcome #PeterDinklage from #GameOfThrones to #XMEN #DaysofFuturePast Very very excited!”

There’s no word yet on which Marvel character the “Game of Thrones” star will play in the “First Class” sequel, which is expected to alternate between present day and a dystopian future.

As Entertainment Weekly notes, the 43-year-old actor might be playing Puck or MODOK. Both mutant characters are known for being strong yet short in stature.

Ian McKellen, Patrick Stewart, Michael Fassbender, James McAvoy, Jennifer Lawrence and Nicholas Hoult have all signed on to reprise their respective roles in “X-Men: Days of Future Past.” The film is expected to hit theaters in July 2014.