The Kansas City Chiefs could be without their top two pass rushers for a while after Tamba Hali sprained his right ankle and Justin Houston sprained an elbow in a 41-38 loss to San Diego on Sunday.
Neither player was in the locker room after the game, but Chiefs coach Andy Reid said both of them would have MRI exams on Monday.
Kansas City plays the Denver Broncos, who beat them a week ago, in their crucial return game at Arrowhead Stadium next Sunday.
The Chargers (5-6) similarly could be without top running back Ryan Mathews for a while after he left the game with a hamstring injury.
San Diego coach Mike McCoy did not disclose the severity of the injury after the game, though Ronnie Brown and Danny Woodhead fared well in relief.
Houston was hurt while chasing down a play when Chiefs safety Eric Berry collided with his right arm. Houston was eventually helped off the field, his arm kept motionless, and helped to the locker room in the waning minutes of the first half.
Hali rolled his ankle while trying to get into the Chargers' backfield earlier in the second quarter. He was helped from the field, loaded onto a cart and also taken to the locker room.
Cleveland lost a key offensive player when quarterback Jason Campbell left with a concussion following a sack in the third quarter in the Browns' loss against Pittsburgh.
Campbell was hit from the side by blitzing cornerback William Gay, who came in untouched. Campbell was hit in the helmet and fumbled as he fell to the ground. Pittsburgh's Will Allen returned the ball 49 yards to set up a touchdown.
Campbell stayed on the turf for several minutes. As he was being treated by Cleveland trainers, Steelers quarterback Ben Roethlisberger came over to check on Campbell.
Campbell was examined on the sideline before he was carted to the locker room, his head slumped as he was driven off.
Tampa Bay cornerback Darrelle Revis left the Buccaneers' win over Detroit with a groin injury. Tampa Bay also lost tight end Tom Crabtree to an arm injury.
Rookie running back Zac Stacy was among three St. Louis Rams players evaluated for concussion-like symptoms against the Chicago Bears. Stacy, guard Chris Williams and cornerback Trumaine Johnson were all ruled out.
Johnson was down for several minutes early in the third quarter after leading with his head on a tackle.
Stacy scored his fourth touchdown in three games and had 87 yards on 12 carries.
Dallas Cowboys cornerback Morris Claiborne left the win against the New York Giants with a hamstring injury in the third quarter. The Cowboys also had punt and kickoff returner Dwayne Harris leave in the first half with a hamstring injury.
New York center Jim Cordle hurt a knee late in the drive and was replaced by left guard Kevin Boothe. James Brewer took over at left guard.
Raiders tight end Mychal Rivera left in the first half with a concussion after a helmet-to-helmet hit from Titans safety Michael Griffin. Oakland cornerback Mike Jenkins (concussion) and linebacker Kevin Burnett (bruised quad) and Tennessee tight end Craig Stevens (concussion) also left with injuries.
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AP NFL website: www.pro32.ap.org
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