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Look out, NBA ... ISO JOE IS BACK!!!

Ex-NBA All-Star-turned-BIG3 dominator Joe Johnson just signed a new contract with the Detroit Pistons on Thursday ... agreeing to a partially-guaranteed 1-year deal.

Don't be surprised ... 38-year-old Johnson LIT UP the BIG3 this season -- averaging 21.9 points a game and 3.9 assists a game for the Triplets, hitting 6-game winners during the season while leading his squad to a BIG3 championship. He was also named league MVP.

As the season wrapped up, there was a buzz NBA teams were interested -- and Ice Cube told us straight-up Joe was getting serious looks. In fact, NBA owners were attending games just to check out Joe's talents.

Johnson had been flirting with teams since the BIG3 wrapped up a couple weeks ago ... working out for the Bucks, Nets and Pistons and ultimately Detroit pulled the trigger.

Just a few weeks ago, we spoke with Johnson about a potential NBA career and he told us he willing to play his ass off for whoever signed 'em ... telling us he still has a blast playing basketball.

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The 7-time All-Star last played for the Rockets in 2018 before joining Cube's league this past season.

It's not just a big move for Joe, but it also proves the BIG3 is a real option for players looking to prove they can still compete in the NBA.