Filming on the sequel to Sylvester Stallone’s 2010 all-star action movie The Expendables is set to begin in September, and now rumors are starting to swirl about what action heavyweights will be along for the ride this time around. Shooting will be taking place in Bulgaria, and the CEO of Bulgaria-based NU Boyana studios David Varod recently dropped some huge names when listing the cast for The Expendables 2 to Novinite: Sylvester Stallone, Jason Statham, John Travolta, Arnold Schwarzenegger, Chuck Norris, Jean-Claude Van Damme, Dolph Lundgren, Mickey Rourke and Bruce Willis.

We expected Stallone, Statham, Lundgren and Rourke to return, but this is the first time we’ve heard of Travolta, Norris and Vam Damme’s involvement (Stallone has been wanting Schwarzenegger and Willis to return for a while). However, just because Varod listed them off doesn’t mean all of these actors mentioned are definitely in the film. Hit the jump for more.

While it would certainly be cool to see all of these guys together in the same movie, this casting rumor should be taken with a grain of salt. Some of the actors may simply be on a wishlist or “in talks,” and even if they do appear it could be in a cameo-type role similar to Schwarzenegger and Willis’ involvement in the first film. Nevertheless, if Stallone has assembled all those mentioned, The Expendables 2 could prove to be the testosterone-fueled equivalent of New Year’s Eve. Simon West (Con Air) is directing, with the film slated for August 17th, 2012.