Rivaldo is one of the most unique players I've ever seen. From his personality to his football, the guy is one of a kind. Certainly one of the best players of the last 15 years (since I started following football).
In Greece he'll probably not get a chance to be in the squad for the next WC....but it wouldn't be the worst idea ever. If Ronaldo is a starter even on bad form, Rivaldo should at least be in the squad too.