Sorry, Bucs fans -- Tom Brady almost certainly ain't bringing Rob Gronkowski to Tampa this season ... Gronk's bro tells TMZ Sports he thinks the TE is officially DONE with football.
"I can't say anything for him," Chris Gronkowski says. "But, I think that he might be moving on ... I would be surprised for sure."
Of course, rumors have flown about a possible Gronk-Brady reunion in Tampa this past week ... with some thinking, the move is in the best interest of both parties now that TB12 is the Bucs' new starter.