Tagovailoa has suffered four documented concussions during his career.

Instead of another blowout loss in Buffalo, the underdog Miami Dolphins and coach Mike McDaniel gave the Bills everything they could handle before losing 31-21 on "Thursday Night Football."

The Dolphins lead the all-time series with the Bills, 62-60-1, including playoffs, but Buffalo has won six straight, 13 of the past 14 and nine consecutive meetings in western New York since 2016.