Floyd Mayweather wants to make the fight with Conor McGregor happen but is struggling
Conor McGregor became the first ever UFC fighter to hold two belts simultaneously in November but has taken an extended break from competition ahead of the birth of his first child.
Floyd Mayweather meanwhile is happily retired with a boxing record of 49-0 but has admitted that a fight against McGregor would tempt him get back in the ring again.
However, the pair have yet to come to an agreement over a fight that will be the most financially lucrative of all time.
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When McGregor travels for fights, he always needs to carry a passport for his shoes as certain states restrict certain materials. His favourite pair are made from crocodile skin
And Mayweather, who runs his own promotion company, believes that McGregor's problem lies in his contract with UFC.
"There's a difference between being an employee and an employer," Mayweather told The Daily Telegraph.
"If someone says 'I want to fight Floyd Mayweather', I can simply say 'yes, let's make it happen'.
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"But when you've got a guy like Conor McGregor he has to talk to [UFC president] Dana White .
"Dana has to talk to Dana's bosses.
"Conor's not a shot-caller.
Floyd Mayweather fought Manny Pacquiao in 2015, one of the biggest fights in history
"When they said 'Why is Floyd Mayweather not fighting Manny Pacquiao?', it was because Manny Pacquiao had a boss.
"I don't have a boss.
"We could have easily made the fight happen years ago.
Conor McGregor is under contract with UFC president Dana White
"Everything happens for a reason.
"The first time I was going to fight Manny Pacquiao I was guaranteed $50million but I had patience.
"And when I had patience that fight became a $300m fight."
Nevertheless, Mayweather is still talking up the prospect of taking on the UFC star.
"The difference between me and him is this: he has to fight," Mayweather added.
"If I was him and I was smart, before I lose again in the UFC I'd let Floyd Mayweather kick my a** for a lot of money.
"It makes business sense."