Penn State linebacker Michael Mauti will undergo an MRI on his left knee Sunday after suffering an injury in the first half of Saturday's win against Eastern Michigan.
"I think we've lost Mike for the year," coach Joe Paterno said. "... He's got an ACL."
Mauti missed the entire 2009 season after tearing the ACL in his right knee during a preseason practice. He also missed some time last season with a shoulder injury but recorded 67 tackles, including 5.5 tackles for loss.
The 6-foot-2, 242 pound junior had three tackles for loss and an interception in Penn State's 14-10 win at Temple last week.
Penn State cornerback D'Anton Lynn, who had to be carted off the field in the second half, suffered a neck stinger and had feeling in all of his extremities.
Adam Rittenberg covers Big Ten football for ESPN.com. He can be reached at firstname.lastname@example.org.