The wide receiver showed concussion symptoms and the game wasn't stopped.

A source told ESPN's Dan Graziano on Tuesday that the NFL Players Association has initiated an investigation into why the game wasn’t stopped when DeVante Parker showed concussion symptoms.

Parker was clearly disoriented as he was getting up after a hit in the first half, and teammate Nelson Agholor had to signal to the officials to stop the game.

On Tuesday, Parker posted on Instagram “Get on yalls f---in jobs @NFL,” and thanked his teammate for being aware of the situation.

The NFLPA initiated a review earlier this season after Miami Dolphins quarterback Tua Tagovailoa was allowed to return to a September 25 game despite hitting his head on the ground and stumbling while attempting to stand and walk.

He was cleared of a concussion but suffered a more severe one in the following game four days later and was briefly hospitalized.

After that reveiw, the unaffiliated neurotrauma consultant for the game was fired and the NFL and the players' union implemented an amendment to the concussion protocol to add ataxia to the list of “no-go” symptoms.

The joint statement read: “Ataxia' is defined as an abnormality of balance/stability, motor coordination or dysfunctional speech caused by a neurological issue.

“In other words, if a player is diagnosed with 'ataxia' by any club or neutral physician involved in the application of the Concussion Protocol, he will be prohibited from returning to the game, and will receive the follow-up care required by the Protocol.”

The head injury Parker suffered was on a 10-yard catch in the first quarter during a game against the Arizona Cardinals.