What we know about the injury to Dolphins QB Tua Tagovailoa, and what's next

The joint concussion protocol of the NFL and NFL Players Association is facing serious questions Friday,

one day after Miami Dolphins quarterback Tua Tagovailoa suffered a concussion and was briefly hospitalized during his team's 27-15 loss to the Cincinnati Bengals.

The injury occurred with 5 minutes, 15 seconds remaining in the second quarter at Paycor Stadium in Cincinnati.

Tagovailoa's head hit the ground when he was sacked by Bengals defensive lineman Josh Tupou.

Tagovailoa's arms grew rigid and his fingers curled in what appeared to be a "fencing response." Medical officials placed him on a stretcher and wheeled him to an ambulance.

The timing of the concussion ignited renewed scrutiny of the hit Tagovailoa took four days earlier in Miami when he was shoved to the ground by Buffalo Bills linebacker Matt Milano after throwing a pass.

Tagovailoa grabbed his head and then stumbled after getting off the ground.

The Dolphins originally labeled it a head injury but then later attributed the stumble to ankle and back injuries and allowed him to finish the game after he cleared an evaluation at halftime.

"We'll have all of those interviews," NFL chief medical officer Dr. Allen Sills told the NFL Network.

"We'll review all of the video, we'll review all of the data. And the purpose of that review is to make sure that the concussion protocol was followed."

It was revealed Saturday that the unaffiliated neurotrauma consultant involved in clearing Tagovailoa was fired after it was learned he made "several mistakes," sources told ESPN Dolphins reporter Marcel Louis-Jacques.

The NFL and its players' union said Saturday that modifications to the concussion protocol are needed.

Let's take a closer look at the issues surrounding Tagovailoa's condition,

his next steps and what consequences -- if any -- will arise from an NFL/NFLPA investigation. -- Kevin Seifert

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