One of the side stories to next week's pay-per-view mega-bout, is the war of words between Floyd Mayweather Sr. and UFC superstar Conor McGregor.

Floyd Sr.'s son, Floyd Mayweather Jr. (49-0, 26 KOs), will face McGregor on August 26th at the T-Mobile Arena in Las Vegas. Showtime Pay-Per-View will carry the bout.

Mayweather Jr. - 40 years old - is coming back from a two year retirement. He was last seen in action back in September of 2015, when he won a dominant decision over Andre Berto at the MGM Grand. He retired after that contest. The bout with McGregor will be Mayweather's last bout, claims the former pound-for-pound king.

Floyd Sr. believes that he personally could defeat McGregor if the two of them got in the ring against each other.

The elder Mayweather is not impressed with anything in McGregor's arsenal and feels confident that his will do a number on the MMA star.

“Like I said many times before, Floyd is better. But I’m saying here now, he’s training good enough for a guy like this. Conor, first of all, showed the whole world his egg, and I think you know what I’m talking about” Floyd Sr. continued. “And guess what, it ain’t nothing.”

Former three division world champion Shane Mosley, who lost a twelve round decision to Mayweather Jr. in 2010, believes a fight between McGregor and Floyd Sr. would actually be a close contest.

Mosley is backing Mayweather Jr. to win next Saturday's fight in style.

"I can't even come up with a scenario [where McGregor would win]. The best fight that I think is Floyd Mayweather Sr. and McGregor. He's 64-years old. Now that's a fight. That's a good fight where I don't know who's gonna win. And I slightly, I slightly pick Floyd Mayweather Sr. I slightly pick him but I don't know who's gonna win that fight," Mosley told Fox Sports.