Charlie Sheen Joining Expendables 2?

It seems that it doesn't matter how terrible you are in your personal life there is a role for you in Expendables 2. Charlie Sheen is rumored to be in mind for ”a washed-up-but-useful CIA type” role. Bruce Willis is of course in talks for the villain and Arnold Schwarzenegger is likely to have a bigger role too. I wouldn't doubt seeing Mel Gibson joining too since he seems desperate enough after getting bumped from Hangover 2.