Mark Wahlberg: Calvin Johnson Should Unretire ... Come to the Pats!!!

Mark Wahlberg ain't buyin' Calvin Johnson's retirement announcement -- saying he hopes the whole thing is just a ploy so CJ can join the New England Patriots.

Wahlberg was out in Bev Hills when a photog broke the news to him about CJ's retirement from the Detroit Lions.

MW's reaction -- "Wow, well hopefully he just did that to get out of his contract with Detroit. Then he'll come to New England and get a ring!"

"He needs a ring! He's too good ... he's got too much left in the tank."

Wahlberg also talked about Peyton Manning -- giving the guy some serious props ... and predicted how much longer his good friend Tom Brady will stay in the league.