LOS ANGELES (AP) -UCLA quarterback Ben Olson will be sidelined three to four weeks with a partial tear of the lateral collateral ligament in his left knee.
The school announced that arthroscopic surgery on Olson's knee Tuesday showed he didn't have torn cartilage.
The Bruins (4-2, 3-0 Pac-10) are off this week. Their next game is Oct. 20 against No. 2 California (5-0, 2-0) at the Rose Bowl.
Patrick Cowan, Olson's backup, is also sidelined due to a partial tear of the medial collateral ligament in his right knee. It's uncertain whether Cowan will be able to play against Cal.
Walk-on McLeod Bethel-Thompson played most of the way at quarterback in UCLA's 20-6 loss to Notre Dame last weekend, but was ineffective, completing 12 of 28 passes for 139 yards with four interceptions. He replaced Olson in the first quarter.
Osaar Rasshan, who spent two years practicing at quarterback but moved to wide receiver over the summer, has returned to his original position. Freshman quarterback Chris Forcier hasn't played this season and was expected to redshirt, but it's possible those plans will change.
UCLA linebacker Reggie Carter had arthroscopic surgery to remove a piece of cartilage removed from his right knee Tuesday, the school said. He might be able to play against Cal.

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