However, after being provoked and called out by McGregor, he opted to end his retirement and return for one more fight.
The megafight will take place at the T-Mobile Arena in Las Vegas on August 26, with the undercard starting at 6:00 p.m.
"We've seen a shift in the fitness industry, in that the average consumer is seeking access to the same training that elite athletes have available to them; and more studios and gyms are now dedicated to a specific discipline", said James Williams, CEO of Mayweather Boxing & Fitness.
The move to allow lighter gloves came as a surprise as the 154lbs bout is considerably over the 147lbs limit at which 8oz gloves can be used.
"I'm ready to go to war for the full 12 rounds and I'm ready to put him away in the first 10 seconds, so that's where my head is at".
Mayweather made similar claims a few weeks back, but the difference is that the boxing legend is expecting to make over $300 million for the super fight.
If you've been planning to have your very own McGregor party for the big fight next Saturday and ordering in the live viewing from Sky Sports, we're here to say don't bother. "But eight-ounce gloves, he will be done in two".
It will see two incredible fighters, both now in their prime, pit themselves against each other in a sport that they have dedicated their lives to since they were children to establish who will be crowned the true unified and undisputed king of the middleweight division.
The fight did go on as scheduled and was not only successful in numbers but it was one of the best fights in UFC history.
After the fight, Mayweather says he plans to focus exclusively on building out his multiple business ventures that include several clothing lines, training gear, makeup and even a new Las Vegas strip club called Girl Collection, which opened earlier this year. I know there's talk of an interim belt. In addition, Conor has limited boxing experience himself. "I believe first-round KO in 8-ounce gloves".
"I've said it before, I don't think boxing is the style of fighting that can beat Floyd but saying that there are many, many forms of fighting that can beat him".