There was a very hard hit on Miami Dolphins quarterback Tua Tagovailoa on Sunday against the Buffalo Bills. So much so, that the NFL is looking into reviewing its concussion protocols now.

A source told ESPN’s Adam Schefter that the NFLPA has told the NFL that it wants “to initiate a review of concussion protocols” after the QB reentered the game. Luckily for the Dolphins, Tagovailoa was able to come back in and deliver a great touchdown drive after leaving the game for a little bit.

Tagovailoa was hit by Bills LB Matt Milano after throwing the ball, and his head smacked against the turf. The Dolphins QB was seen looking very dizzy and confused after the hit.

Tagovailoa finished the game with 186 yards passing and 1 touchdown. The Dolphins went to beat their division rivals 21-19 after a Bills receiver could not get out of bounds to stop the clock with no timeouts left.

It’ll be interesting to see how the league handles this situation.