Los Angeles Chargers wide receiver Keenan Allen was carted to the locker room late in the fourth quarter of Saturday's game against the Kansas City Chiefs with a back injury
Allen was deemed questionable to return.
Prior to leaving the game, Allen caught five passes for 54 yards on eight targets.
Allen is in the midst of an outstanding campaign, but the 25-year-old has never completed a full season during his five-year career.