Michigan cornerback Jeremy Clark will undergo surgery to repair a torn ACL in “about a week and a half,” said coach Jim Harbaugh Thursday morning on Detroit’s WXYT 97.1.

“Every day is going to be a healing day for him,” Harbaugh said. “He may not even feel injured in two months, and it should be nine months before he plays again.”

Clark, who was injured in the second half of last week’s 49-10 win vs. Penn State, had 10 tackles and three pass breakups in the Wolverines’ first four games. Harbaugh mentioned earlier this week that he will explore a medical redshirt for his fifth-year senior.

“We’re all going to be clients of the health care system at some point, so we’re really glad,” Harbaugh said. “The medicine has gotten so good and the orthopedics so good. We’re really blessed to have this at the U.”

No. 4 Michigan (4-0, 1-0) hosts No. 8 Wisconsin (4-0, 1-0) at 3:30 p.m. Saturday in the Big House.