McKenzie suffered a shoulder injury during Sunday's game against the Steelers, Alaina Getzenberg of ESPN.com reports.
McKenzie returned the opening kickoff 75 yards to set up the Bills at the Steelers' 24-yard line. After going up 3-0, Buffalo forced a punt on Pittsburgh's first possession, which resulted in a McKenzie fair catch. He promptly went to the sideline tent and then to the locker room without a jersey or pads, per Getzenberg. Now deemed questionable to return, it'll be interesting to see who the Bills entrust to return kicks as long as McKenzie is sidelined.