The Bills say they are continuing to follow the NFL's return-to-play protocol for Williams' head injury.
Meanwhile, cornerback Stephon Gilmore (groin) was a full participant Wednesday in practice, which was also his status the final two days of practice last week.
Gilmore told team doctors he couldn't play in Sunday's game and was inactive, and coach Doug Marrone said Wednesday that Gilmore will have to decide whether he's ready to play this Sunday against the Miami Dolphins.
Here is the Bills' full Wednesday injury report:
Did not participate:
LB Keith Rivers (groin)
TE Lee Smith (toe)
S Jonathan Meeks (head)
S Aaron Williams (head)
CB Stephon Gilmore (groin)
WR Sammy Watkins (ribs)