Quarterback Josh Allen took a nasty hit in the fourth quarter of the Buffalo Bills ' 23-20 loss to the Houston Texans in Week 5. Allen's helmet appeared to bump the turf at NRG Stadium. Per Ryan Miller of Democrat and Chronicle, Allen completed a concussion evaluation in four minutes, a relatively fast time to check for a brain injury:

The NFL and its players association say the required steps were followed when Buffalo Bills quarterback Josh Allen was evaluated for a concussion last week at Houston and cleared to return to the game.

Neuroscientist Chris Nowinski has said he wants the NFL to investigate the apparent head injury suffered by Buffalo Bills quarterback Josh Allen during Sunday’s defeat to the Houston Texans. Bills head coach Sean McDermott told reporters on Monday that Allen “was cleared and he went back in the game” after being examined by medical staff for concussion and chest and ankle injuries.