McGregor, however, is under contract to the Ultimate Fighting Championship series, which would have to approve any deal for the bout to happen.
“I don’t want to hear no more excuses about the money, about the UFC,” Mayweather said. “Sign the paper with the UFC so you can fight me in June. Simple and plain. Let’s fight in June. If you want to fight, sign the paperwork, let’s do it.”
McGregor is on a break for the impending birth of his first child, a son with his long-time girlfriend Dee Devlin, who is due to give birth in May.
This list has to start with the most famous injury of all, with Mike Tyson biting off Holyfield’s ear in their 1997 bout.
He suffered a post-fight broken jaw after James Butler sucker punched him following their 10-round fight in 2001.
Arguably the most gruesome injury ever suffered in a ring, he literally had his brain knocked loose from his skull in 1930.
The Ukrainian was left extremely bloody when Lennox Lewis gave him a major cut above his eye in a 2003 fight.
There’s swelling and then there’s what Rahman suffered when Evander Holyfield gave him this football-sized lump.