Coach Dick Jauron said Parrish injured the shoulder after falling on it late in Thursday's practice. He did not participate in Friday's workout after he developed some soreness in the area.
Parrish, Buffalo's third receiver, leads the league with a 17.5-yard punt return average. He also has 33 catches for 307 yards, and has scored a rushing, receiving and return touchdown.
Tight end Robert Royal (knee) practiced on Friday and is probable.
Copyright 2007 by The Associated Press