Floyd Mayweather has again offered to train Anthony Joshua ahead of his heavyweight rematch against Oleksandr Usyk.
The American retired as one of the greatest boxers of all-time with a 50-0 record and world titles in five divisions.
"TBE" has not worked with Joshua but was present to witness his win over Kubrat Pulev in December 2020.
Usyk would outpoint Joshua to claim heavyweight gold in September but Mayweather does not believe it was an upset.
"That was not an upset," Mayweather told reporters in California when asked about the Joshua vs Usyk fight.
"When you've got two guys with so much experience, like I said before, it's just that Anthony Joshua was on TV more so everybody had seen him.
"Usyk is a hell of a fighter, a gold medalist if I'm not mistaken, but he was behind the scenes.
"You had two guys with an amateur background, and one guy was not being seen while the other was, and we called it an upset - no, it's just that Usyk was working behind the scenes while Joshua was in front of everybody.
"Finally, they met up and Anthony Joshua came up short."
Whether Joshua makes a change remains to be seen with the Briton pictured training with other coaches last month.
One of the trainers includes Eddy Reynoso but Mayweather himself weighed in on the situation and would be interested in working with him.
"I told him from the beginning, I came on the record from the beginning, I told him to come and I could teach him some pointers," Mayweather said.
"A lot of the time, this is just my take, the same coach you had as an amateur doesn't always make you a great professional.
"Some guys are great at amateur coaching and some guys are great at professional coaching, and even my dad was the best at professional.
"At the amateurs, he was teaching me like a professional, so I'm going to always speak real whether people like it or not.
"I feel like Anthony Joshua, they're going to different coaches and saying 'this coach is going to work with him'.
"But I told him at the beginning when he was undefeated 'you've got some things you need to tweak because if you don't then you may come up short'."