ANN ARBOR, Mich. -- Michigan star tight end Colston Loveland has been ruled out of Saturday's game against No. 11 USC with an undisclosed injury.

Loveland suffered an apparent shoulder injury in last weekend's win over Arkansas State. Michigan coach Sherrone Moore hasn't specified the nature of the injury.

A preseason All-American, Loveland leads the Wolverines with 19 catches for 187 yards; no other Michigan pass catcher has more than nine receptions.

The No. 18 Wolverines also changed starting quarterbacks this week, moving from Davis Warren to Alex Orji. Warren had thrown six interceptions in three games, including three last weekend. He threw two picks in a 31-12 loss to Texas on Sept. 7.

Orji has only seven career passing attempts but has rushed for 58 yards in a relief role this season.

Moore said this week that he wants to see Orji "take the reins" of the Michigan offense with his opportunity.

"Excited for him," Moore said. "I know he's chomping at the bit."