Minnesota quarterback Christian Ponder was able to take the majority of the Vikings' practice snaps on Thursday, and was able to throw with extra padding around his ribs. But if Ponder's rib injury is still limiting him after Friday's practice, the team could name Matt Cassel the starter for Sunday. Frazier said Cassel took the majority of practice snaps Wednesday and pointed out that "we signed Matt Cassel for occasions like this -- if something were to happen to Christia
