By Edward Chaykovsky

Former five division world champion Floyd Mayweather Jr. (49-0, 26 KOs) has been inactive since announcing his retirement in September 2015, after dominating Andre Berto over twelve rounds at the MGM Grand in Las Vegas.

On Friday, the future Hall of Famer turned 40-years-old.

During a televised interview on Showtime to celebrate his birthday, the topic of a comeback was obviously explored. And once again, the undefeated fighter continued to call for a boxing match with UFC superstar Conor McGregor.

During the last twelve months, Mayweather and McGregor have challenged each other in numerous press interviews and on social media.

Mayweather, even on his birthday, said he was ready and willing to fight McGregor.

"I'm here to say today, on 2/24 on my birthday... they keep throwing the Conor McGregor name out there. Like I said before, let's make it happen," Mayweather told Showtime analyst Steve Farhood.

Even if the fight was allowed to happen, almost everyone expects a one-sided mismatch.

Mayweather, who many view as the best promotional salesman of this generation, disagrees with the critics who the reject the idea of a competitive fight.

"Every time Conor McGregor goes out there and competes and wins - he does it standing up. When Conor McGregor did lose [to Nate Diaz], he lost on the ground. He didn't lose standing up. He's a hell of a fighter and a very tough competitor. And he has the will to win," Mayweather said.

"The UFC gloves, they are no different from boxing gloves. They are just a little bit smaller. But if a guy got power, he got power - and Conor McGregor got power."

Mayweather would not reveal his asking price to get back in the ring - which almost everyone expects would be at least a guarantee of a $100 million. He wants McGregor to work out his contractual situation with the UFC.

The UFC has McGregor under an exclusive contract, and company president Dana White will not allow McGregor to have a boxing match with Mayweather or anyone else. According to White, McGregor is contractually tied to the UFC for at least four more fights.

"We don't really have to talk about [my guarantee]. We already know what my number is. Like I said before, my team and us - my number is there. He has to get his thing in order with his team. Once Conor McGregor speaks with the UFC and his bosses, then we can make it happen - because we already know that Floyd Mayweather is his own boss," Mayweather said.

"We have Showtime, Showtime PPV, Mayweather Promotions - which is the past, the present and future of sports and entertainment - let's make the fight happen. Let's give the fans what they want to see. There is only one fight out there that's important - that's Mayweather and Conor McGregor."

"I can't really say [if it will happen]. It's been talked [about], but nothing has been signed with ink yet. Conor McGregor believes in himself. I believe in myself. He believes in his skills, I believe in my skills. He's a lot younger, he's been active. I've been on the shelf for a couple of years. We just have to see [if it can be done]."