Michigan will be without starting safety Jordan Kovacs for today's game against Purdue.
Kovacs is out with a knee injury. He's questionable for next week's game at Iowa.
Kovacs ranks third on the team in tackles (42) and leads Michigan with three sacks, as he has been very effective on blitzes. He also has an interception, a forced fumble and a fumble recovery.
Senior Troy Woolfolk will shift from cornerback to safety to fill Kovacs' spot against the Boilers. Woolfolk made six starts at safety in the 2009 season. Freshman Blake Countess will fill Woolfolk's starting cornerback spot.