Take a look at the filmmaker's Twitter message.
The filmmaker didn't reveal which character Omar Sy will portray. Some have speculated that he will portray Bishop, a mutant who has the ability to absorb all forms of radiation and energy and release it through his body. Nothing has been confirmed by the studio or Bryan Singer quite yet.
Omar Sy joins a growing cast that includes James McAvoy, Michael Fassbender, Rose Byrne, Jennifer Lawrence, Nicholas Hoult, Patrick Stewart, Ian McKellen, Hugh Jackman, Anna Paquin, Ellen Page, Shawn Ashmore, and Peter Dinklage.