The Hollywood Reporter says that Alan Arkin, Jack Black, Billy Crystal, Jean-Claude Van Damme and the previously-announced Zach Galifianakis are looking to take on cameo roles in The Muppets.
The James Bobin-directed film stars Jason Segel, Amy Adams, Chris Cooper, Rashida Jones, Zach Galifianakis, Danny Trejo and Donald Glover.
Arkin is playing a tour guide while Black will play a kidnap victim. Galifianakis plays a hobo.
The Muppets is now filming for a December 25, 2011 release