Eastwoon is working on a big screen adaptation of the hit stage show about Frankie Valli and the Four Seasons. Walken will play a New Jersey mobster who helped the group build a music career, reported Deadline.
Walken will play Angelo 'Gyp' DeCarlo in the film. Eastwood will reportedly pick up young faces to play Valli and his bandmates.
Broadway star John Lloyd Young, who played Valli in the New York show, is rumoured to be reprising his role for the film, and Boardwalk Empire's Vincent Piazza is also said to be among the cast.