UPDATE: Bills coach Rex Ryan told the team that Aaron Williams suffered an apparent concussion.

#Bills DL Kyle Williams says Rex Ryan told the team Aaron Williams suffered what looks like a "concussion," not a neck injury. — Vic Carucci (@viccarucci) August 11, 2016

The Buffalo Bills have suffered injuries to key players in seemingly every practice since beginning training camp at St. John Fisher College last week.

Just one day after learning that rookie linebacker Reggie Ragland, would likely miss the upcoming season with a torn ACL, safety Aaron Williams had to leave Thursday night’s practice with an apparent shoulder injury.

Aaron Williams is down after a collision w Dez Lewis. Athletic training staff attending to him. Lewis right shoulder appears hurt. #Bills — Vic Carucci (@viccarucci) August 11, 2016

This is quite the setback for Williams, who is returning from a neck injury that caused him to not only miss 13 games last season, but led him to consider retirement as well.

Fortunately, Williams was able to walk to the locker room under his own power, as Heather Prusak of WGRZ tweeted.

Aaron Williams walking to the locker room holding his head. @WGRZ pic.twitter.com/0IYADakhTM — Heather Prusak (@haprusak) August 11, 2016

With their first preseason game at 7 p.m. ET on Saturday night, Bills’ head coach Rex Ryan opted to end the teams pad-less practice about 25 minutes early, preventing the loss of any more players.