Iso Joe has been straight-up KILLIN' IT in the BIG3 this season ... and his old employer has taken notice, 'cause Ice Cube tells TMZ Sports NBA scouts have been coming to watch Joe Johnson!!
The ex-NBA star was just named the 3-on-3 league's MVP ... and it was an absolute no-brainer. The guy led the league with 21.9 points a game and 3.9 assists a game for the Triplets.
Johnson was a helluva NBA player, too ... he was a 7-time All-Star and at one point in his 17-year career, averaged at least 20 points a game in 5 straight seasons.