DAVIE, Fla. -- Miami Dolphins rookie quarterback Tua Tagovailoa was downgraded from questionable to doubtful for Sunday's game vs. the New York Jets due to a left thumb injury that he suffered during practice this week.
Veteran Ryan Fitzpatrick is expected to start for Tagovailoa.
The Dolphins elevated rookie practice squad quarterback Reid Sinnett to the active roster for the first time this season, another sign that Tagovailoa is expected to be inactive Sunday. Sinnett would serve as Fitzpatrick's backup in his first NFL game.
Tagovailoa jammed the thumb on his left throwing hand on a teammates' helmet during Wednesday's practice, which limited him throughout the week though he was seen throwing and practicing every day.