Texans star running back Arian Foster has a groin injury, coach Bill O'Brien said Wednesday after practice.

O'Brien said Foster is still being evaluated but he would miss time, although how much was unspecified. A source told ESPN.com that Foster will have groin surgery Friday in Philadelphia and likely will miss the regular-season opener.

Foster was second in the NFL in yards rushing per game (95.8) and sixth in total yards rushing (1,246) in 2014.

"I feel bad for him personally," O'Brien said. "I think he came into this offseason and really worked extremely hard. But as a football team, it's next man up."

That most likely will be second-year back Alfred Blue, who spelled Foster last year and ran for 528 yards.

Medical timeout rule

The NFL's new rule calling for a medical timeout when a player appears possibly concussed might have helped after a Super Bowl play involving Patriots wide receiver Julian Edelman.

Edelman appeared dazed after a hit by Seahawks safety Kam Chancellor in the fourth quarter. New England was in an up-tempo offense and Edelman remained in the game. Soon after, he caught the winning touchdown pass.

Dr. Richard Ellenbogen, co-chair of the NFL's Head, Neck and Spine Committee, said Wednesday that 90 percent of concussions can clear within minutes. So had a medical timeout rule been in place for the Super Bowl, Ellenbogen said Edelman might have immediately tested positive for a concussion, been removed from the game and not caught the TD pass.

Team physicians on the field will be able to watch replays this season to figure out how someone was hurt. The medical trainer in the press box can send a replay down to the field to help the doctors make a diagnosis if they didn't see the hit.

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From staff and wire reports