"You fittin' to get a monster!"
Former Patriots Super Bowl MVP Deion Branch says Cam Newton is going to go OFF in 2020 ... telling TMZ Sports the QB is poised for a huge season as Tom Brady's replacement.
"I think this guy's going to erupt, man," the ex-Pats wideout says. "I think this is going to be a crazy season for him."
As for why ... Branch tells us he believes Cam's going to come into New England motivated -- and says that should be a scary sight for the rest of the league.