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If you were thinking The Expendables couldn't get any more macho or testosterone-fuelled, think again, as yet another action legend has been added to the cast.

Bruce Willis - star of Die Hard one-thru-four as well as The Last Boy Scout, Armageddon and The Fifth Element - has signed up for what could be the greatest action movie of them all.

Speaking to MTV, Willis revealed that he has yet to shoot the cameo, but that he is leaving time open on his schedule for it. "I don't know anything about [my character] yet, haven't seen any pages" he explained. "But I'm excited about it."

And in news that is sure to excite action fans of the 1980s and '90s, the scene looks set to finally unite the three biggest stars of that era in the shape of Willis, Sylvester Stallone and Arnold Schwarzenegger.

"That's the concept," Willis revealed. "That's the plan."

The Expendables revolves around a group of mercenaries endeavouring to overthrow a South American dictator, and stars Jason Statham, Jet Li, Mickey Rourke, Dolph Lundgren, Steve Austin, Terry Crews and Randy Couture, as well as the aforementioned triumvirate of testosterone.