Gerard Butler Playing "Man Of Steel" Villain?

Zach Snyder has confirmed that Viggo Mortensen and Daniel Day-Lewis are not starring in his "Man Of Steel" film. But there are some rumors suggesting that "300" star, Gerard Butler wants to reunite with Snyder and he could possibly end up appearing in "Superman: The Man Of Steel".
So could Butler be up for the role of General Zod or another possible villain in the film?