Tua Tagovailoa was foolish for returning to the Bills game on Sunday after slamming his head on the turf ... so says famed neuropathologist Bennet Omalu -- who tells TMZ Sports the Dolphins quarterback put his life at risk by making the comeback.
Dr. Omalu -- who's the real-life inspiration for the famous Will Smith "Concussion" movie -- says that under no circumstances should Tagovailoa have come back into the contest in Miami after he was initially knocked out of it.