McCoy remains in the concussion protocol, Bills coach Sean McDermott said Saturday during a brief meeting with reporters. McCoy suffered a concussion early in Buffalo's loss to Indianapolis in Week 7.
Running back Taiwan Jones (neck) will be out Monday, leaving just Ivory and Marcus Murphy as certain participants as Buffalo waits out McCoy's recovery.
Elsewhere in injury news Saturday:
- Patriots running back Sony Michel, who avoided a serious knee injury Sunday, returned to practice Saturday.
Michel is listed as doubtful to play Monday against the Bills, while tight end Rob Gronkowski (back/ankle), linebacker Dont'a Hightower (knee), wide receiver Josh Gordon (hamstring) and tackles Trent Brown (ankle) and Marcus Cannon (concussion) are questionable.
- Free-agent receiver Jeremy Maclin won't be available to join a team in need, undergoing a procedure on a hamstring/glute injury that has kept him from working out for clubs, NFL Network's Mike Garafolo reported Saturday.