Dolphins' Tagovailoa remains in concussion protocol with no timeline for return

Miami Dolphins quarterback Tua Tagovailoa underwent additional testing Friday and remained in the concussion protocol a day after hitting his head against the turf.

Tagovailoa had a headache Thursday night and Friday morning, Dolphins coach Mike McDaniel said. The team was waiting for results from the MRI, which McDaniel said was done out of "extra precaution" on top of the CT scans and X-rays taken the night before.

McDaniel said he had no timetable on when Tagovailoa might be able to return.

Tagovailoa was sacked by Bengals defensive tackle Josh Topou late in the first half Thursday. On the play, he spun awkwardly and was thrown to the turf. While on the ground, Tagovailoa appeared to display the fencing response, with his fingers frozen in front of his face.

He remained down for more than seven minutes before being loaded onto a backboard and stretchered off the field. He was taken to University of Cincinnati Medical Center for evaluation.

The Dolphins later said he was conscious and had movement in all of his extremities. He was discharged Thursday night and flew back to Miami with the team.

QB Tua Tagovailoa is expected to be discharged from the University of Cincinnati Medical Center and will fly home with the team tonight.

McDaniel said Tagovailoa was interacting with teammates on the flight home. He sat next to McDaniel and talked to him about the game.

"His personality was normal Tua," McDaniel added.

It was unclear what is next for Tagovailoa, whose breakout season has been interrupted by a scary injury two weeks after he threw a career-high six touchdowns in Week 2 against Baltimore.

It is another obstacle in what has been an up-and-down NFL career for the former Alabama quarterback.

The Dolphins, amid a