DeVante Parker chastises NFL, which is probing why his head injury wasn't flagged during Monday's game

The NFL and NFLPA will review their concussion-reporting policy after New England Patriots wide receiver DeVante Parker nearly continued playing despite sustaining a head injury during Monday's game, according to NFL Network's Ian Rapoport.

Parker responded to the news of the investigation on social media after it broke on Tuesday. He's not happy with the NFL. He is thankful for his teammate Nelson Agholor, who saw his injury where others missed it.

A social media post below contains NSFW language:

Parker sustained the injury in the first quarter of Monday's game against the Arizona Cardinals. Parker made a catch on a slant route to pick up a first down. Cardinals cornerback Antonio Hamilton landed on Parker awkwardly, causing the ball to come out at the end of the play.

The Patriots tried to quickly run up to the line in case the Cardinals wanted to challenge whether Parker caught the ball. Agholor noticed Parker was wobbly and slow getting lined up, so Agholor took a knee and tried to wave at officials to stop the game.

Officials stopped the game as the Cardinals challenged the result of the play. Parker left the game and did not return due to a head injury.

Officials upheld the ruling on the field of a catch.

NFL under scrutiny for how it handles head injuries

The fact that Parker nearly lined up for another play is troubling, especially after the league vowed to refine its policy for reporting injuries. Spotters at each game are tasked with identifying whether players need to leave contests due to potential head injuries.

The Miami Dolphins found themselves at the center of the issue after quarterback Tua Tagovailoa was allowed to re-enter a game after wobbling and dropping to the ground after taking a hit. The Dolphins said Tagovailoa sustained a back injury, which allowed him to go back into the contest. The NFLPA initiated an investigation into the situation after Tagovailoa was allowed to return. Tagovailoa then sustained a concussion and was knocked unconscious during the team's next game, just a few days later.

The NFL and NFLPA revised their concussion protocol shortly after Tagovailoa's injury.

The Dolphins once again found themselves in the center of the concussion discussion after Teddy Bridgewater left the team's next game after the revised protocols were announced.

While the league has made strides to crack down on head injuries, Monday's error shows there's still work to be done. Credit to Agholor for noticing something was wrong and making officials stop the game before Parker continued playing.

That's not supposed to be Agholor's job, but it's a good thing he stepped in.