Per Tim's press conference twitter, David Molk has a torn ACL and will miss the rest of the season. Here's a kitten:
Feeling better? No? Oh.
I assume Michigan will go back to the line configuration they used last month when Molk was out with a broken foot. Left to right, that was Ortmann, Schilling, Moosman, Huyge, and Dorrestein. First guy off the bench now is probably John Ferrara, who saw some time in the Iowa game when Huyge wasn't playing well or had a minor injury.
Though Molk missed a ton of time and saw only three plays before getting knocked out against Penn State, he's not eligible for a medical redshirt. One play against PSU killed any possibility of that, and medical redshirts are only available for players who haven't already taken a normal redshirt. There is some possibility the NCAA might provide a hardship waiver if Molk suffers another season-ending injury, but even that's doubtful.