Miami Dolphins quarterback Tua Tagovailoa suffered a concussion when he hit his head against the turf and underwent additional testing Friday.

Tagovailoa had a headache Thursday night and Friday morning, Dolphins coach Mike McDaniel said. The team was waiting still 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.

"I’m not even really thinking about timetables or anything regarding him as a player right now," McDaniel said. "It’s all about Tua the person."

The 24-year-old QB posted a message on Twitter on Friday afternoon thanking people for their support in the aftermath of his head injury.

"I'm feeling much better and focused on recovering so I can get back out on the field with my teammates," the statement read.

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.