Hugh Jackman was rumored last month to be joining the cast of director Bryan Singer's X-Men: Days of Future Past, but now the filmmaker has made the casting official via his Twitter account.

"I would officially like to welcome @RealHughJackman to the cast of #Xmen Days of Future Past. Very excited! More to come..." Singer said.

Jackman is joining a cast that includes James McAvoy, Jennifer Lawrence, Michael Fassbender, Nicholas Hoult, Ian McKellen and Patrick Stewart.

Scheduled for release on July 18, 2014, X-Men: Days of Future Past features a script by Simon Kinberg and is said to be inspired Chris Claremont and John Byrne's comic book storyline that ran in "Uncanny X-Men" #141 and 142 back in 1981. "Days of Future Past" introduced the idea of an alternate future for Marvel's mutants that grew out of the Brotherhood of Evil Mutants killing an important senator, leading to a future where all mutants are hunted by Sentinels.

In addition to playing a key role in the comic book version of the story, Wolverine has appeared in every live-action "X-Men" film to date and will star in his second solo adventure with the July 26 release The Wolverine.