Karrueche Tran I'm Not Dating Soccer Stud ... We're Just Friends

She's partied with him all over the world ... and was recently spotted at his game ... but Karrueche Tran tells SF she's definitely NOT dating soccer superstar Memphis Depay.
But watch the video ... it's not the most convincing denial we've ever seen.
Tran first hung out the Manchester United stud in Miami back in June -- and was spotted in the crowd at one of his games just a few weeks ago.
But when we saw Chris Brown's ex-girlfriend out at Beso in Hollywood this week ... she insisted they're nothing more than friends.