Brissett (right thumb) is on track to start Sunday's game against the Bills, according to ESPN's Adam Schefter.
With Brissett dealing with a thumb issue and Jimmy Garoppolo a right shoulder injury, evidently Brissett is the closer to full strength of the two signal-callers, which puts him in line to start Sunday's game. In any case, top QB Tom Brady is set to return to action in Week 5, so both Brissett and Garoppolo are slated to revert to reserve roles next weekend.