McGregor will be competing in his first sanctioned boxing match against a boxer widely regarded as the best of his era, and arguably the sport's greatest-ever defensive fighter.
McGregor's left hand is rearranging Mayweather's face-perhaps the best chance the Crumlin man has of causing one of the biggest upsets in combat sports history at T-Mobile Arena later in the summer.
No announcement has been made regarding the first public press conference for the fight but UFC president Dana White said earlier this week that arrangements are being made that will put Mayweather and McGregor in the same room in the very near future.
A later picture captures McGregor posing in front of punch bags with the huge image of Mayweather's predicted defeat looming over him.
Unfortunately, I don't think we're lucky enough for the fight to last just 15 seconds.
"Everybody knows. Conor is not a boxer, just a show". Every time he fights he's doubted, people are like, 'You can't do this, you can't do that'.
"This is business. Conor with Floyd is not a boxing fight because Conor is not a boxer". Because rest assured, with the social media frenzy that's coming surrounding this fight and all the coverage it'll receive between now and fight night, the bulk of the money bet will come from casual bettors.
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But Golovkin-Alvarez is a fight for the ages, one of the most eagerly awaited boxing match-ups in recent memory.
The 40-year-old Mayweather has been retired since beating Andre Berto in September 2015 and improving his career record to 49-0.
McGregor is an extremely skilled athlete who started boxing at age 12 and later transitioned to Mixed Martial Arts after becoming an All-Ireland youth boxing champion.
His boxing licence was granted by the California State Athletic Commission in December, allowing him to box in the U.S. state.
"I don't really want to get into details on what we're looking to do".
In an interview with MMA Fighting's Ariel Helwani, the Ultimate Fighter season five victor said: "I think everybody is trying to put the pressure on us with these rumours and stuff".