The NFL and NFLPA have initiated a standard review of concussion protocols after New York Giants receiver Sterling Shepard suffered one last Sunday and was allowed to finish the game, league sources told ESPN on Saturday.
There was a breach in the protocol and now both sides are trying to figure out how and why, sources told ESPN.
The controversial play occurred in the third quarter of Sunday's game against the Dallas Cowboys, when Shepard ran into cornerback Anthony Brown and fell backward to the ground, clearly staggered.
Shepard struggled to get up and waved off the Giants' calls to come out of the game.