Miami Dolphins quarterback Tua Tagovailoa has been placed in concussion protocol in his latest serious head scare after suffering two in quick succession earlier this year.
In October, Tagovailoa was told by Dr Bennet Omalu, the first doctor to discover findings on chromic traumatic encephalopathy (CTE) in American Football players, that he should retire immediately after two concussions in five days.
Tagovailoa shockingly suffered what looked to be a severe concussion on a Thursday night loss to the Cincinnati Bengals, just days after many believed him to have suffered one in the win over Buffalo Bills. The Dolphins and the NFL alike were highly-criticised for their handling of the situation, with a number of world-renowned neuroscientists warning of the dangers of having two concussions in a short space of time.