Gillislee was pulled from Saturday's game to be evaluated for a potential concussion, Joe Buscaglia of WKBW reports.
With news of Karlos Williams' release this morning, Gillislee was expected to prove his worth as a backup throughout Saturday's preseason game. However, it appears the head injury that he suffered is going to push back any verdicts a bit. Gillislee is competing with both Reggie Bush and Jonathan Williams for the primary backup spot to LeSean McCoy.