An injury to his left, non-throwing shoulder limited Brady's participation in practice Friday for a second straight day after he sat out practice on Wednesday. He stretched with his teammates during the brief period open to reporters Friday.
The "probable" designation means that there is a "virtual certainty" a player will be available for normal duty, according to the injury report.
Sixteen other Patriots who had limited participation Friday were listed as "questionable" for the game, meaning there is a 50-50 chance they won't play.
Asked what Brady was able to do Thursday, coach Bill Belichick said Friday: "Play quarterback, the usual thing." When asked if Wednesday was a planned day off for Brady, Belichick said he thought he had covered that topic.
The Patriots have said Wednesday's absence was not injury-related.
Comcast SportsNet has reported that Brady had X-rays to check for a separated left shoulder and was told he was "all set."
Offensive linemen Logan Mankins and Sebastian Vollmer were listed as "out" for Sunday's game.