PITTSFORD, N.Y. (AP) Buffalo Bills safety Aaron Williams and wide receiver Dez Lewis were injured Thursday night following a hard collision at the team's practice.
Williams is being treated for a ''suspected concussion,'' the team said after practice. There was no update on Lewis.
The collision took place during a team drill. Both players stayed on the ground before eventually walking to the locker room under their own power. Lewis appeared to be holding his right arm as he walked to the locker room.
The collision was extra concerning because Williams is attempting to make his way back from a neck injury. He played in just three games last season before undergoing neck surgery. Williams had a bone shaved in his neck to correct a nerve impingement, which had been causing numbness.
Players said after practice that Bills coach Rex Ryan told the team Williams' injury did not involve his neck.
''It's under our impression that at least it's not a neck thing, at least I know that much,'' safety Corey Graham said. ''I don't know exactly what's wrong, but at least we know it's not anything wrong with his neck.''
''It seems like good news is coming out,'' linebacker Preston Brown said. ''I don't think it's his neck.''
Williams had a concussion in Buffalo's season opener in 2014.
The Bills have been counting on Williams to return and fortify their secondary after a disappointing year overall on defense. The 26-year-old has been one of Buffalo's best playmakers since making the switch from cornerback to safety in 2013. Williams has 237 tackles and seven interceptions.
Lewis was a seventh-round pick in 2015 and made strides this offseason. He's expected to be one of Buffalo's top five receivers this season.
The injuries took place at Buffalo's final practice before its preseason opener on Saturday against Indianapolis.
AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFL