Floyd Mayweather Jr. has not been shy about how much money he can potentially make in his fight against Conor McGregor. The undefeated boxing champion recently stated that he stands to make at least $300 million off of his bout with the UFC champ.

Mayweather made the comment in an upcoming episode of Showtime's "All Access: Mayweather  v. McGregor," ahead of the Aug. 26 fight in Las Vegas.

READ: Floyd Mayweather vs. Conor McGregor Betting Odds: Fans Overwhelmingly Picking UFC Star

Mayweather claimed he doesn’t need to ink a long-term contract to earn a big return like other athletes. He said he can make it all in one 12-round fight.

"I mean, am I the highest-paid athlete out there? And just coming back? We not talking about no contract," he said on "All Access."

"We not talking about no contract for no four years, or no contract for no five years. I can do it in 36 minutes. $300 (million) or better in 36 minutes."

He added, "I can’t say what the UFC is paying [McGregor], but every month I make millions, so they talk about it, I be about it. I really got it. Y’all not gonna make this in a lifetime."

McGregor could earn at least $100 million for the bout. The lightweight champion is UFC's highest-paid fighter and the biggest earner in MMA history.

Mayweather had discussed how much money he stood to earn in a January interview on ESPN's "First Take."

814573822 Mayweather claimed he stands to make over $300 million from the McGregor fight. Pictured above is Dana White is holding Floyd Mayweather Jr. and Conor McGregor apart on July 14, 2017, during the Floyd Mayweather Jr. v Conor McGregor World Press Tour at SSE Arena in London, England. Photo: Getty Images

"My number was a guaranteed $100 million — that was my number," Mayweather said. "We’re the 'A' side, and I don’t really know how much money Conor McGregor has made. I’m pretty sure he hasn’t even made $10 million in a MMA bout."

READ: Floyd Mayweather vs. Conor McGregor: Betting Odds, Chance For Knockout Or Decision

Mayweather is boxing's richest prize fighter. The 40-year-old received his biggest payday for a May 2015 fight against Manny Pacquiao. The fight generated a record-breaking $600 million payoff, the largest amount for a boxing event.

ESPN's Darren Rovell cited a source that estimated Mayweather raked in between $200 and $230 million for the Pacquiao fight. Based on the 60-40 split, Pacquiao reportedly walked away with an estimated $150 million.