The undefeated boxer and the UFC star have been sniping at each other in recent days with heavy speculation about a potential multi-million dollar mega-fight.
Two weight world champion Conor McGregor got a boxing licence last month that prompted fans and media to talk up a meeting with Floyd Mayweather that could happen next year.
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McGregor said he would knock out the 49-0 boxing champ, who has won world titles in five divisions, prompting Mayweather to laugh at the prospect of facing the Irishman.
McGregor then went on an x-rated rant, saying "f*** Floyd Mayweather" as he claimed he would be the bigger draw if they met in the ring.
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Mayweather has since offered £8,000 to fans to provide a caption of McGregor tapping out against Diaz in their first fight, before warning he would "slap the s***" out of the Notorious.
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Mayweather has again mocked McGregor - calling up Diaz to chat about the Dubliner.
In a live video posted on Instagram, Mayweather said to Diaz: "I see what you did to him.
"Now I'm gonna put the finishing touches on him."