Tua Tagovailoa suffered his second diagnosed concussion of the season against the Packers in Miami on Sunday and has entered concussion protocol, according to NFL Network's insider Ian Rapoport.

Tagovailoa took a substantial hit to the back of the head from the turf as he was tackled by Kingsley Enagbare of Green Bay. His head bounced off the ground on the play that came with just over two minutes to play in the second quarter. Miami failed to score after that point, and Tagovailoa went on to throw three uncharacteristic interceptions in the fourth quarter as the Dolphins fell short 26-20.

Now, Tagovailoa's status is in doubt heading into the last two weeks of the season. Miami needs to win at least one of its last two games to stay in the playoff race, but the health of their franchise quarterback needs to come first.

While officially this is Tagovailoa's second concussion of the season, it is widely believed by fans, media members, and observing medical professionals that this is his third. There has been wide speculation that he suffered one against the Bills in week three of the NFL season. During that game, he took a nasty hit to the head, stumbled around after getting up, was pulled from the game, and sent back in with the issue being described as a back injury.

The very next week against the Cincinnati Bengals, he took the now famous hit that led to him lying on the field motionless in a "fencing pose," something indicative of neurological trauma.

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Following the hits he took in weeks three and four, Tagovailoa missed two games and the NFL and NFLPA agreed to a revised set of protocols regarding how concussions and suspected concussions are handled. Most notable, the NFL added a spotter at every game who can radio to the medical teams on either sideline to have a player pulled for further examination.

However, these changes in protocol are not fool-proof. No one - not the spotter, not the medical staff, not the coaches, not the players - thought to pull Tagovailoa off the field after the second quarter hit.

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