Browns' quarterback Derek Anderson and tight end Kellen Winslow underwent further medical tests Monday on potential season-ending injuries. Anderson will sit out at least this week's game at Tennessee and could miss Cleveland's final four games after injuring his left knee against the Colts. "Just looking at it, the best-case scenario might be a hyperextended knee," Coach Romeo Crennel said. "Worse case, it's some kind of ligament damage." Winslow got hurt in the third quarter while blocking on a running play and did not return. He was already playing with a sprained right shoulder.