Former Alabama football quarterback and current Dolphins signal-caller was ruled out of Miami's "Thursday Night Football" game vs. the Bills with a concussion.

The injury occurred on a quarterback scramble by Tagovailoa just under the 5-minute mark in the third quarter. He lowered his head and collided with Bills safety Damar Hamlin, hitting his head again on the turf, before laying on the ground for several moments. That prompted Miami medical personnel to attend to him on the field at Hard Rock Stadium.

He was able to walk off the field on his own.

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Here's what to know of Tagovailoa's injury update and concussion history.

Tua Tagovailoa injury update

Speaking to reporters after the game, Dolphins coach Mike McDaniel said he spoke with Tagovailoa, who was in good spirits and went home. He added that he is concerned more with his health than a timeline of return.

The Dolphins officially ruled Tagovailoa out for the remainder of the game with a concussion. Per a report from "TNF" sideline reporter Kaylee Hartung, the Dolphins were able to determine in under six minutes that Tagovailoa had a concussion.

Per reports, Tagovailoa entered the NFL concussion protocol, which is conducted by a team doctor or unaffiliated neurotrauma consultant and includes a player examination. Doctors look for "no-go" syptoms in players, such as loss of consciousness, gross motor instability, confusion, ataxia and more.

With Tagovailoa concussed, the next steps to determine whether he can return to play is whether he clears concussion protocol, which includes several steps. Players will not be cleared to play until they clear each step, which include symptom-limited activity; aerobic exercise; football-specific exercise, non-contact drills and full football activity.

A player must be cleared both by a team doctor and an unaffiliated neurotrauma consultant.

REQUIRED READING: Tua Tagovailoa concussion timeline: Dolphins QB exits game against Bills with head injury

How many concussions does Tua Tagovailoa have?

Tagovailoa has three confirmed over the last two-plus seasons, with his third occuring on "Thursday Night Football." He had two confirmed in 2022 — in Week 4 vs. the Bengals and on Christmas Day vs. the Packers.

He also hit the back of his helmet in Week 3 of the 2022 season, though was able to return to play and cleared the NFL concussion protocol the next day.

This article originally appeared on The Tuscaloosa News: Tua Tagovailoa injury update: Miami QB concussed vs Bills on 'TNF'