Michigan quarterback Cade McNamara sustained a right shoulder injury in a loss to Penn State on Saturday afternoon.

McNamara went to the locker room with the injury early on in the game, but was able to return. However, he was replaced again by backup Joe Milton on the final drive.

Wolverines coach Jim Harbaugh told reporters after the game that McNamara’s shoulder tightened up again in the fourth quarter.

“It was a gritty performance by him,” Harbaugh said. “That’s a tough kid.”

McNamara completed 12-of-25 passes for 91 yards in the loss. He won the starting job after relieving Milton last week against Rutgers. He threw four touchdown passes in a triple overtime victory over the Scarlett Knights.

Milton went 1-for-3 against the Nittany Lions on Saturday.

It’s currently unclear how serious McNamara’s injury will be longterm.

Michigan is now 2-4 on the season and will host Maryland next weekend.