Michigan senior cornerback Jeremy Clark, who has played some of the best cornerback in the Big Ten so far this season, went down with what appeared to be a serious injury on Saturday in the fourth quarter against Penn State.

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Jim Harbaugh didn't mince words when saying he believes it's a serious injury.

"Everybody is down a little bit right now," he said. "We think it's an ACL. We'll know more tonight on it, but the team has been down and sad about it in the locker room for him. I don't think we're going to be able to dodge a bullet on that one."

Clark, who started Michigan's first three games of the season, went down on in a non-contact situation while playing special teams midway through the fourth quarter.