Brissett was forced out of Sunday's game against the Buccaneers after suffering a hamstring injury.
With Tua Tagovailoa (ribs) on IR, Reid Sinnett is poised to take over the Dolphins' QB duties Sunday. If the injury ends up being serious enough to threaten Brissett's Week 6 status, Tagovailoa's progress will be worth monitoring closely as next weekend's game against the Jaguars approaches.