Dolphins head coach Mike McDaniel confirmed the news on Wednesday.
Tagovailoa has yet to be officially scrapped for Sunday’s important duel against the New England Patriotsbut it’s unclear when the Dolphins will see him back on the field.
McDaniel added that the Dolphins are advancing to this game with Teddy Bridgewater in the starting role.
McDaniel and team members grew concerned when they saw “irregularities” with Tagovailoa while watching footage from Sunday’s game, the head coach said.
Tagovailoa met with doctors Monday afternoon and was placed on the NFL’s concussion protocol after reporting symptoms.
The 24-year-old and only in his third season as a professional, Tagovailoa has now suffered two confirmed concussions since the start of the season.
In September, he had to undergo concussion protocol after suffering a terrifying tackle that left him unconscious for a period of time in the Dolphins’ Week 4 game at Cincinnati. He had left the field on a stretcher and returned in week number seven.
Four days earlier, in a win over the Buffalo Bills, Tagovailoa had also been hit hard. He appeared to have concussion symptoms but was assessed and remained in the game, a decision that drew criticism.
Shortly thereafter, NFL officials changed concussion protocol to require any player displaying possible symptoms of a concussion, including lack of balance or stability, to miss the remainder of a game.