Brett Favre is certain Aaron Rodgers will head into Sunday's matchup against his old team with some extra motivation ... telling TMZ Sports he's sure the QB "will want to play the best game he's ever played" vs. the Packers.
The Pittsburgh Steelers signal-caller is facing off with Green Bay for the first time since it traded him back in 2023 ... and Favre told us this week there's just no way his former teammate is viewing the tilt as just another game.
Favre said Rodgers "certainly doesn't want to lay an egg on maybe his last game against the Packers" -- although he didn't necessarily think Aaron's looking for any kind of "revenge.