HOUSTON (AP) Houston's Jadeveon Clowney, the top overall pick in this year's draft, injured his knee Sunday and didn't return against Washington.
Coach Bill O'Brien didn't provide much more information on Clowney's health after the game.
''They think it's a good prognosis, so it looks like it's going to be OK,'' O'Brien said. ''He may miss some time, he may not. Who knows? So we'll know better as the week goes on.''
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.
Clowney has struggled to stay on the field since joining the Texans. He left a dual practice Aug. 20 after a helmet-to-helmet hit with Denver Broncos tight end Jacob Tamme. He missed the Texans' final two preseason games, but said he passed the NFL protocols for head injuries in just over a week. He had to sit out the beginning of camp, too, after offseason surgery to repair a sports hernia.
Washington nose tackle Barry Cofield and tight end Jordan Reed were injured against the Texans in the first half. Cofield injured his ankle and Reed his hamstring.
Neither player returned.
AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFL