MIAMI GARDENS — The Miami Dolphins placed Tua Tagovailoa on injured reserve Tuesday after the quarterback was diagnosed with his third concussion in two years.

Tagovailoa will be sidelined for at least four games. He will be eligible to return in Week 8 when the Dolphins host Arizona, but has to complete a series of tests and assessments required by the NFL’s concussion protocol before he can return to the field.

Tagovailoa was hurt last Thursday night when he collided with Buffalo defensive back Damar Hamlin. He ran for a first down and then initiated the contact by lowering his shoulder into Hamlin instead of sliding.

Players from both teams immediately motioned that Tagovailoa was hurt, and as he lay on the turf the quarterback exhibited some signs typically associated with a traumatic brain injury. He remained down on the field for a couple of minutes, got to his feet and walked to the sideline. The Dolphins diagnosed him with a concussion a few minutes later.

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Coach McDaniel Focuses on Tagovailoa’s Health

Coach Mike McDaniel has since cautioned against speculation on the quarterback’s future, stressing that he’s more focused on Tagovailoa getting healthy than what this latest concussion means for the team or for his career. Tagovailoa this week began the process of consulting neurologists about his health amid reports that he has no plans to retire.

Others around the NFL have offered their opinions on Tagovailoa’s future, including Raiders coach Antonio Pierce, who suggested he should retire.

“As far as Tua’s career is concerned, I think it’s an utmost priority of mine for Tua to speak on Tua’s career,” McDaniel said Monday. “Reports are reports. As far as I’m concerned, I’m just worried about the human being and where that’s at day to day. I’ll let Tua be the champion of his own career.”

McDaniel said Tagovailoa was at the team’s practice facility on Monday, greeting teammates and working with trainers.

“He’s doing good, man. Talked to him, he’s in good spirits,” receiver Jaylen Waddle said Monday. “(He’s) got the team in good spirits and everybody praying for him and hoping (for his) health.”

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Tagovailoa’s History of Head Injuries

Head injuries have become a familiar, scary occurrence throughout Tagovailoa’s career.

In a September 2022 game against the Bills, he took a hit from linebacker Matt Milano, which caused him to slam to the ground. He appeared disoriented afterward and stumbled as he tried to get to his feet. He was cleared to return to that game and later said it was a back injury that caused the stumble. He was not diagnosed with a concussion.

Four days later, he got hit again during a Thursday night game at Cincinnati in which he was briefly knocked unconscious and was taken off the field on a stretcher. As he lay on the turf, his fingers appeared to display the “fencing response,” an involuntary motion typically associated with a brain injury. That time, he was placed in the concussion protocol.

The NFL and the players’ union made changes to the concussion protocol after those two incidents with Tagovailoa. Players who have problems with balance or stability are now prohibited from returning to a game.

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Tagovailoa’s Future and Dolphins’ Plans

Tagovailoa briefly considered retirement, but instead returned and studied ways to better protect himself on the field, including taking jiu-jitsu classes ahead of the 2023 season.

Tagovailoa has said he spoke to numerous neurologists who told him they did not believe he would be more susceptible to head injuries than any other player moving forward, nor would he be at a higher risk for chronic traumatic encephalopathy (CTE), the brain disease associated with repeated blows to the head. He was also diagnosed with a concussion while in college at Alabama.

With Tagovailoa sidelined, the Dolphins will go with backup Skylar Thompson when play at Seattle on Sunday. Miami also signed Tyler Huntley off the Ravens’ practice squad.