doctors speculated the cardiac events stemmed from a hit to the chest, it s not clear what caused his heart to stop. the bills are set to host the mi am miami dolphins. tua tagovailoa is ruled out because he s still in the nfl s concussion program. tua missed the teams final games after being discussion zugsed with the second concussion of the year following a loss to the packers. he missed another two games earlier in the season after he had a concussion against the bengals, four days after allowed to return to a thursday night game despite a hit that appeared to leave him disoriented. people that i was another concussion as well. it was not official diagnosed. they re going to start tyler