USC's Marc Tyler dislocates shoulder

SAN FRANCISCO -- University of Southern California running back Marc Tyler dislocated his left shoulder in the third quarter of the Trojans' 30-9 win over Cal at AT&T Park on Thursday and could be out an extended period of time.

Tyler, a redshirt senior, suffered the injury on the first play of the second half, when he was tackled 2 yards behind the line of scrimmage by Cal linebacker Aaron Tipoti. Tyler knew immediately he had dislocated the shoulder, he said, but the team's training staff popped it back into place on the sidelines.

He then went to the locker room for X-rays, which were negative. After the game, Tyler would not rule himself out for USC's next game against Notre Dame on Oct. 22. But he didn't give any sort of timetable for his return.

"I don't know how long I'll be out," Tyler said. "This (has) never really happened to me before."

Dislocated shoulders typically take two or three weeks to heal. USC coach Lane Kiffin said he did not know when Tyler could be healthy.

Tyler finished the game with 11 carries for 30 yards and two catches for 9 yards.

In other injury news, USC receiver Marqise Lee suffered a sprained AC joint in his right shoulder but expects to practice Sunday and should be available for the Notre Dame game.

Cornerback Anthony Brown, who started his second straight game against Cal, broke his left ankle in the first half and is expected to be out for the rest of the season.

Pedro Moura covers USC for ESPNLosAngeles.com.