Sterling Shepard’s concussion could lead to a change in NFL policy.

The NFL and NFLPA have initiated a review of concussion protocols after the Giants’ receiver suffered a concussion last Sunday, yet was allowed to stay in and finish the Giants game at Dallas, ESPN’s Adam Schefter reported Saturday, citing league sources.

There was a breach in the protocol and now the league and union are trying to figure out how and why, according to the report.

The report stated the controversial play occurred in the third quarter, when Shepard ran into cornerback Anthony Brown and fell backward to the ground. A staggered Shepard struggled to get up and waved off the Giants’ calls for him to come out of the game.

The NFL has neurological spotters on both sidelines and in the press box to prevent players from staying in games after they are knocked for a loop. But, according to the report, the Giants and those officials did not flag the play. The veteran receiver finished the game, playing 68 of the 69 offensive snaps.

This is only the fourth time since 2017 that a concussion evaluation was flagged for review.

“I wasn’t really sure what was going on,” receiver Russell Shepard said. “After seeing the play and seeing certain things during the week I think the front office, the coaching staff as well as Shep are all trying to come together and make the best out of the situation. I’m not quite sure everything that happened throughout the game but I know they’re going to do the best thing to protect him going forward.”

On Friday, Shepard was officially ruled out for Sunday’s game against the Bills, sidelining the Giants’ new No. 1 wide receiver for the first time since 2017. Shepard had six catches for 42 yards in the season-opening loss after recovering from a fractured thumb that he suffered during training camp.

“He’s getting better,” coach Pat Shurmur said Friday, referring to Shepard’s concussion. “He just kind of ran out of time this week.”