Ian McKellen, Patrick Stewart Set for ‘X-Men’ Sequel

Ian McKellen and Patrick Stewart are cast in the "X-Men" sequel "X: Men: Days of Future Past"

Bryan Singer took to the web Tuesday to confirm key casting for the upcoming sequel  “X-Men: Days of Future Past.”

Deals are already locked in place for the cast of "X-Men: First Class" to return for the sequel, including January Jones,  but Singer said on his Twitter feed on Tuesday:

“I’d like to officially welcome back James McAvoy, Jennifer Lawrence, Michael Fassbender and Nicholas Hoult to ‘X-Men: Days Of Future Past,’". In a separate tweet he said: “Also thrilled to announce Sir Ian Mckellen and Sir Patrick Stewart.”

It was announced recently that Singer will direct “X-Men: Days of Future Past."  Fox is aiming to release the film on July 18, 2014.

The film will most likely shoot in London next spring. Singer was originally slated to serve as a producer on the film, alongside Lauren Shuler Donner and Simon Kinberg.