Tom Brady is not on the injury report, but the New England Patriots quarterback was not present for Thursday's practice.
Earlier in the day, the Patriots re-signed quarterback McLeod Bethel-Thompson to the practice squad.
Brady is not on the injury report released Wednesday. An update to that report is not due until the end of the Patriots' morning practice.
His backup, rookie second-round pick Jimmy Garoppolo, took the first-team snaps.
Brady missed a handful of midweek practices last season including one Thursday practice due to flu-like symptoms, but rebounded in plenty of time to play Sunday.
New England opens the regular season Sunday (1 p.m. ET) at Miami.