Aaron Williams injury: Buffalo Bills safety limited on Wednesday

All eyes were on the Buffalo Bills' secondary as the team returned to the practice field on Wednesday, and for now, the news is okay: safety Aaron Williams (head) was a limited participant, while starting cornerback Stephon Gilmore (groin) practiced in full.

Williams left Sunday's overtime win over the Chicago Bears early with what was reported as concussion symptoms, but the fact that he's back on the practice field already - even in a limited capacity - bodes well for his chances of playing on Sunday. Williams will need to clear the NFL's concussion protocol in full in order to play against the Dolphins.

Gilmore missed the Bears game, and was effectively a game-time decision, listed as questionable and working out on the field just prior to the contest. His full participation on Wednesday is encouraging, but he'll need to avoid a setback to maintain trajectory toward his 2014 season debut.

Sammy Watkins, who played all but three snaps in the Bears game despite a lingering rib injury, was also a full participant on Wednesday. He will likely continue to be listed on the injury report until the injury has fully healed.

Two players did not participate in the session: reserve tight end Lee Smith (toe) and starting linebacker Keith Rivers (groin). Rivers was not even spotted in the building, which does not bode well for his chances of playing on Sunday; rookie Preston Brown would likely make a second straight start in his stead. Smith hasn't taken part in on-field activities since August 28.

Jonathan Meeks, who has not appeared in a Bills game since August 9, remained limited on Wednesday, as well. The team is now listing his ailment as a head injury, but it had been previously reported as a neck issue.