The NFL Players Association is looking into why Monday night's game wasn't stopped when New England Patriots wide receiver DeVante Parker showed concussion symptoms.

Parker was wobbly getting up after a hit in the first half against the Arizona Cardinals. Nelson Agholor had to signal to the officials to stop the game and remove Parker before the next play.

Parker called out the NFL via his Instagram story on Tuesday, writing: "Get on yalls f---in jobs @NFL," and thanked Agholor for being "aware of the situation."