Miami Dolphins quarterback Ryan Fitzpatrick replaced Tua Tagovailoa in the fourth quarter of Sunday's 20-13 loss to the Denver Broncos.
The Dolphins trailed 20-10 when Tagovailoa was benched.
Tagovailoa had some rookie struggles Sunday, going 11-of-20 for 83 yards and a touchdown, but he wasn't helped by his offensive line. He was sacked six times -- more than he was sacked (four) in four previous games.
On the last sack, by Broncos outside linebacker Bradley Chubb, Tagovailoa appeared to twist one ankle and land awkwardly on the other.