Tony Ferguson has a loud, finger-waggin' message for Conor McGregor ...
I'LL SEE YOU AFTER FLOYD, SON!!
We got T-Ferg leaving the first Mayweather-McGregor press conference at Staples Center Tuesday ... and the UFC lightweight contender wasted no time telling Conor -- the UFC lightweight champ -- what's up.
That said, Ferguson -- whose next fight isn't booked -- is open to other matchups ... like one with Justin Gaethje -- who dropped one of the most violent/awesome UFC debuts EVER last week.
"If he wants his a** kicked we'll handle that," Tony told TMZ Sports.
Basically, give the dude whatever gets him the gold. Right now, that's Conor ... unless the Irishman vacates his belt after cashing $100 mil vs. Floyd.