LOS ANGELES -- USC quarterback Matt Barkley suffered a sprained AC joint in his right shoulder against UCLA on Saturday and will not play against No. 1 Notre Dame this week, Trojans coach Lane Kiffin said Sunday night.
Redshirt freshman Max Wittek will start in Barkley's place, Kiffin said.
Barkley hurt the shoulder when he was sacked with two-plus minutes remaining in USC's 38-28 loss at the Rose Bowl. He was examined on the field by the school's training staff before walking off on his own but did not return to the game.
"I feel bad for him and his family," Kiffin said. "This is obviously not how you want it to be."
Roughly an hour after the game ended, Barkley left the stadium with his right arm hidden in a sweater. His shoulder appeared to be supported by a sling, but he declined to offer information on the injury, citing the program's policy.
USC normally does not disclose or discuss injuries unless the players are confirmed to be out for the season.
This will be Barkley's second time missing a rivalry game against Notre Dame. He sat out of the teams' matchup in November 2010 because of a sprained ankle suffered the previous week against Oregon State.
USC lost that game at home to the Irish, with a Mitch Mustain-led comeback attempt failing in rare heavy rain at the Coliseum.
Wittek, who enrolled at USC in January 2011 out of the same high school as Barkley, Santa Ana Mater Dei, has never started a collegiate game.
In three appearances this season, Wittek has completed 8-of-9 passes for 95 yards, a touchdown and no interceptions. He has been sacked once.
He replaced Barkley on Saturday against UCLA and completed all three of his pass attempts.
Information from The Associated Press was used in this report.