Tagovailoa remains in the concussion protocol after being slammed to the turf in the Dolphins' loss to the Cincinnati Bengals last Thursday.
Dolphins coach Mike McDaniel said there's no timeline on his return. The Dolphins (3-1) visit the New York Jets (2-2) on Sunday.
"He'll be out for this game against the Jets," McDaniel said Monday.
Teddy Bridgewater will draw the start. The Dolphins signed QB Reid Sinnett to their practice squad.
McDaniel said Tagovailoa is spending time in the practice facility as he goes through the concussion protocol. He added that the quarterback's MRI came back clean.