Conor McGregor Intensifies Nate Diaz Rivalry With Fresh Attack On Social Media
But that hasn't stopped McGregor from being linked with a sensational UFC return amid speculation linking him to a mega-rematch with Khabib Nurmagomedov.
The 'Notorious' has now posted a letter he received from USADA and insisted that he is still retired, despite making his MMA return back in January.
McGregor wrote on Twitter: "What's going on here [UFC]? USADA have just arrived to my yacht this morning for testing?
"I've retired guys! But go on then, I'll allow them test me. It's all natural here baby! Forever and always, God Bless Folded hands 180km across the Mediterranean Sea tomorrow! LET'S GO!!"
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The Irishman continued in a separate tweet by taking a shot at Diaz, who he fought in back-to-back super-fights in 2016.
McGregor tweeted: "Juice head rats @NateDiaz209."
Diaz and McGregor had been tipped to complete their trilogy of fights after it emerged that UFC could attempt to book the mega-fight on 'Fight Island.'
However, UFC president Dana White has since played down the idea that a third fight between McGregor and Diaz is in the works.
When asked if UFC was attempting to book the third fight, White said at the UFC 249 post-fight press conference: "No. Um... I mean, they don't like each other. But there's nothing going on.
"Conor wants to fight. I don't even know if Nate wants to fight. I think they're just talking s**t to each other."
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