"They thought about 98 percent of it was torn and they need to repair it," said Bill Doba.
McCall, No. 3 on the depth chart most of the season, had his busiest day as a Cougar last week against UCLA, carrying the ball 11 times for 51 yards and catching three passes for 23. For the season, the Carson, Calif., product has 33 carries for 156 yards.
McCall comes from a long line of running backs. His dad Kevin played at Oregon, uncle Robert at Arizona, uncle Chico at Arizona State, uncles Nate and Carlos at New Mexico and cousin Patrick at Oregon State. Earlier issues with ball security have been an issue in the past but Doba said he's shown considerable improvement this year in that regard.
The Cougars' No. 2 running back, Chris Ivory, has missed the past two games with a concussion and has not practiced this week. He will not make the trip to Cal, though he is improving, said Doba.
"...Chris Ivory, they did the baseline test on him again today, and it's just the reaction time with he and Alfonso Jackson, so neither one of those two kids will travel either." said Doba.
"You know, back in the day, they'd have probably played, but then they might have ended up with serious damage or they might have got something else hurt. The biggest thing holding them back is the reaction time."
With Ivory sidelined, second-year freshman Marcus Richmond of Mesa, Ariz., becomes the Cougs' No. 2 running back. He's carried the ball nine times for 38 yards this season.
The Cougars' third running back will be freshman Logwone Mitz of Redmond. But he'll likely only be used in an emergency because the Cougs would like to redshirt him this season.
Doba left open the possibility of a running back by committee approach, depending on how things progress. Ivory should also at some point be back eventually as well.
"...We'll start with Kevin McCall and just see how he does," said Doba. "If he's doing well and runs well -- and there's more to it than just running. There's protection also. We'll have to play it by ear."
Doba also said tight end Jed Collins, who the Cougs have used in short yardage situations in the past as an up back, lead blocker and in max protect, could also play a role.