Conor McGregor once considered Ryan Garcia the future of boxing ... but that certainly ain't the case anymore -- the UFC superstar is now calling for his permanent banishment from competing after getting popped for PEDs earlier this week.
Conor eviscerated King Ryan in a since-deleted social media post late Thursday night ... and it's safe to say he's not buying Garcia's claim that he's never used steroids or any other banned supplement.

5/1/24
I Didn’t Cheat !