It wasn't clear how Clowney was injured, but it happened late in the second quarter. He looked to be arguing with the team doctor as the pair walked off the field to the locker room a couple of minutes before halftime.
"They think it's a good prognosis,
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Cleveland tight end Jordan Cameron aggravated a shoulder injury after catching two passes for 47 yards against Pittsburgh. The Browns also lost running back Ben Tate to a knee injury. Washington tight end Jordan Reed strained his hamstring at Houston.
It was a rough opening game for the Kansas City Chiefs,
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Coach Bill O'Brien didn't provide much more information on Clowney's health after the game.
Other injuries included Steelers' rookie running back Dri Archer,
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Jacksonville lost safety Johnathan Cyprien and linebacker J.T. Thomas to head injuries at Philadelphia. Miami lost starting linebackers Danell Ellerbee (hip) and Koa Misi (ankle) in the first half in a victory over Miami,
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Bills linebacker Keith Rivers injured his groin in a win at Chicago.
Chiefs right tackle Jeff Allen left with a strained biceps. Titans linebacker Zach Brown injured his shoulder,
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Tampa Bay lost newly acquired guard Logan Mankins to a knee injury in the second quarter,
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Johnson went down late in the first half Sunday with nobody around and needed to be carted off the field. Kansas City lost another defensive starter, Mike DeVito, in the second half to the same injury in a loss to Tennessee.
Carolina was without starting quarterback Cam Newton, who fractured his ribs in a preseason game last month. He was declared inactive before the Panthers played Tampa Bay.
"We've got some guys that need to step up and get ready to play," Chiefs linebacker Justin Houston said. "Guys go down all the time and you need to step up."
Houston had a scare when Jadeveon Clowney, the top overall pick in this year's draft, injured his knee and didn't return in a win over the Redskins.
The Rams already lost one quarterback for the season when Sam Bradford injured his knee in the third preseason game. Shaun Hill left St. Louis' loss against Minnesota with a left quadriceps injury. St. Louis also lost defensive end Chris Long to a left ankle injury.
