Miami Dolphins quarterback Tua Tagovailoa left Thursday’s game against the Buffalo Bills with a concussion, the team said announced.

On a fourth-down run in the third quarter, Tagovailoa collided head-on with Bills safety Damar Hamlin as he went to the ground. Tagovailoa’s teammates immediately called for trainers as he lay on the field before eventually walking away under his own power.

Last season was the only year of his career in which Tagovailoa appeared in every game for the Dolphins. In 2022, he played in just 13 games after suffering two concussions.

During a Thursday night game that season against the Cincinnati Bengals, Tagovailoa suffered his first concussion after hitting his head on the ground following a sack.

The concussion Tagovailoa suffered against the Bengals followed a controversy in which the NFLPA found he had not been properly evaluated for a concussion in a game against Buffalo four days earlier. Tagovailoa briefly left that game with an injury but was not evaluated for a concussion, ultimately leading the NFLPA to fire the independent neurotrauma consultant responsible for removing players from the field with suspected head injuries. The controversy resulted in a new concussion protocol for NFL players.

Later that year, Tagovailia suffered another concussion during a game against the Green Bay Packers, although the diagnosis was not made until the day after the game.

Tagovailoa is in his fifth season with the Dolphins, who selected him with the fifth overall pick in the 2020 NFL draft. He led the NFL with 4,624 passing yards last season. Entering Thursday, Tagovailoa was 33-19 in his career with 82 touchdowns and 37 interceptions.

In July, the Dolphins signed Tagovailoa to a four-year, $212.4 million contract, of which $167 million is guaranteed.