Mayweather (Left) Conor (Right) |
This blockage is thought to be McGregor's contract with the UFC and President Dana White's unwillingness to allow the Irishman to cut the organisation out of a deal.
Having risen rapidly through the premier organisation in mixed martial arts, McGregor holds enormous power as the UFC's foremost superstar so White's reluctance to sanction a fight is understandable.
The UFC President told the Telegraph: 'He's (McGregor) under contract with me. How would I let somebody take this guy that I built and do it without me? That would be the stupidest move in history.'
Alarm bells started ringing when McGregor cancelled a Q&A in Ireland to fly out to Las Vegas.
Rumors of both fighters' entourages meeting in Nevada, where McGregor is filming an anti-bullying campaign, now appear to hold weight despite Mayweather originally claiming he would stay retired.