Washington, July 7 -- Bradley Cooper's untitled 'Ocean's Eleven' prequel has expanded its ensemble cast, with Vicky Krieps, George MacKay, Lauren Ridloff and Jack Holden officially joining the Warner Bros. Pictures project.

French actor Omar Sy is also in negotiations to board the comedic heist thriller, adding further international star power to the film, as per The Hollywood Reporter.

The latest additions join a cast that already includes Bradley Cooper, Margot Robbie, Wagner Moura, Monica Barbaro and Josh Gad.

Cooper is directing, writing, producing and starring in the prequel, while Robbie is also serving as a producer through her LuckyChap banner alongside Tom Ackerley.

As per The Hollywood Reporter, production is expected to beg...