Michigan quarterback Wilton Speight will be out multiple weeks coach Jim Harbaugh said Monday. 

Harbaugh didn't go into specifics on Speight's injury, but he did say John O'Korn will start in the Wolverines' rivalry game against Michigan State on Saturday in Ann Arbor and Brandon Peters will be his top backup. 

"John’s done a fantastic job ever since he’s got here, in every role he’s been in, he’s acquitted himself well, including coming off the bench and leading our team to a victory against Purdue. I think that speaks volumes,” Harbaugh told reporters (per Land of 10). 

Speight was sacked Sept. 23 by Purdue's Markus Bailey and took another hit from Eddy Wilson with 5:06 to go in the first quarter. O'Korn stepped in and led the Wolverines to a 28-10 victory over Purdue with one touchdown and one interception. He completed 18 of 26 passes for 270 yards. 

Harbaugh told reporters the hit on Speight was "egregious". 

“Somebody asked me if I saw the play … I thought it was egregious,” Harbaugh told reporters Monday. “With all the emphasis on protecting defenseless players, it appeared the player knew what he was doing.”