Miami Dolphins quarterback Tua Tagovailoa is taken off the field on a stretcher during the first half of an NFL football game against the Cincinnati Bengals, on September 29 in Cincinnati.
CNN  — 

The Miami Dolphins quarterback Tua Tagovailoa was taken off the field on a stretcher on Thursday during a game against the Cincinnati Bengals, after suffering apparent head and neck injuries – less than a week after being injured in another game.

Tagovailoa is conscious, has movement in all his extremities and was taken to a local hospital for further evaluation, the team said in an update. It added that he is expected to be released from the University of Cincinnati Medical Center and travel back to Miami with the team on Thursday night.

Miami Dolphins head coach Mike McDaniel confirmed after the team’s 27-15 loss that Tagovailoa had suffered a concussion – a traumatic brain injury caused by a blow to the head.

In the second quarter, Tagovailoa was sacked by Bengals defensive lineman Josh Tupou and laid motionless on the field for several minutes.

The entire Dolphins sidelines walked onto the field as Tagovailoa was placed on the backboard and stretcher.

Miami Dolphins quarterback Tua Tagovailoa sacked by Cincinnati Bengals' Josh Tupou during the first half of an NFL football game on September 29 in Cincinnati.

Bengals fans in attendance at Paycor Stadium in Cincinnati showed their respect as Tagovailoa was carted off the field.

“It was a scary moment,” McDaniel said after the game. “He was evaluated for a concussion and is in concussion protocol …That was an emotional moment. That is not part of the deal anyone signs up for even though you know its a possibility in football.”

“All of his teammates, myself, we were all very concerned,” he added.

In a statement Thursday night, the National Football League Players Association (NFLPA) said player health and safety were at the “core” of their mission.

“Our concern tonight is for Tua and we hope for a full and speedy recovery,” it said. “Our investigation into the potential protocol violation is ongoing.”

The incident comes just days after Tagovailoa suffered another apparent head injury last Sunday in a game against the Buffalo Bills.

He had exited the game in the second quarter after a hit from linebacker Matt Milano caused his helmet to hit the turf. On his way back to the line of scrimmage, Tagovailoa stumbled and almost lost his balance.

He was then checked for a concussion and cleared, and came back out onto the field in the third quarter.

Tua Tagovailoa being examined during a game against the Cincinnati Bengals, on September 29.

Afterward, the NFLPA told the National Football League (NFL) it wants to initiate a review into the handling of Tagovailoa’s apparent head injury.

The Dolphins later said Tagovailoa suffered a back injury, not a head injury.

Tagovailoa was listed as questionable to play before tonight’s game with a back injury.

On Thursday, McDaniel defended the team’s decision to play Tagovailoa despite the previous injury, saying an independent doctor specializing in “brain matter” had cleared him to play.

“For me, as long as I’m coaching here, I’m not going to fudge that whole situation – if there’s any sort of inclination that someone has a concussion, they go into the concussion protocol,” he said.

“We don’t mess with that. I never have and as long as I’m the head coach, it will never be an issue that you guys have to worry about.”

When asked if there was anything different the team could have done after Tagovailoa’s injury on Sunday, McDaniel responded with a resounding “absolutely not.”

Speaking on New Day, CNN’s chief medical correspondent Dr. Sanjay Gupta called the incident in Thursday’s game “really scary” and “very concerning” – particularly the gesture Tagovailoa made with his hands as he lay on the ground.

“When you look at the video from last night, it obviously looks like a pretty significant injury. Tua’s on the ground for a long time,” said Gupta.

“This movement that he’s doing with his hands … that is a significant sign, something that people really need to pay attention to.

“It can be a sign of basically disrupting some of the pathways, even temporarily, between the brain and the spinal cord … If that sounds serious, it is serious.”

Gupta also said that Tagovailoa appeared to experience “gross motor instability” when he stumbled across the field in Sunday’s game against the Bills and should not have returned to play under the NFL’s Concussion Protocol.

In an interview with CNN on Friday, former NFL defensive end Jack Crawford said his first concern when he saw the incident was of Tagovailoa’s safety.

“Immediately I thought to myself: I hope he’s okay, I hope it’s not too serious,” Crawford, who played for a number of NFL teams, told CNN Sport’s Amanda Davies.

“It’s a part of the game, essentially. The league are doing everything they can to keep a look out for these things and make sure to prevent it, to be honest. The game I think has come a long way as far as helping people or avoiding people getting into those situations.”

When he was playing, Crawford said he’d seen players wanting to stay on the field after suffering injuries.

“I’ve seen people who have had their ‘bell rung’ and they’ve come onto the sideline and you can kind of see that they’re a little bit shaken up but they don’t want to get the attention of the doctors because they want to stay in the game.”