Brissett (hamstring) is listed as questionable for Sunday's game against the Jaguars, Joe Schad of the Palm Beach Post reports.
Regardless of Brissett's health, Tua Tagovailoa (ribs) is expected to come off IR and start under center for the Dolphins in London. If Tagovailoa suffers a setback and Brissett also can't go, Reid Sinnett would be thrust into the starting quarterback role.