Notebook: Defense building depth 

February, 8, 2013
2/08/13
9:00
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As long as Greg Mattison is Michigan's defensive coordinator, he will expect perfection. He demands a lot out of his players because he knows what it takes to reach the NFL.

The 2013 class for Michigan is all about getting to the next level and bringing in players who can help Michigan get there.

Defensive line

Michigan C Cites Concussions In Decision To Quit
Joe Schad discusses how concussions and a concern over long-term health have helped Michigan center Jack Miller decide not to play football his senior year.
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