Scared already? Floyd Mayweather says he's older and has lost a step compared to young McGregor ahead of their bout

Undisputed American boxing champ, Floyd Mayweather has claimed he's not the ruthless fighter he used to be and believes Conor McGregor has an edge in their bout, which is expected to be one of the richest fights in combat sports history.

The 40-year-old in an interview with ESPN admitted that his Irish rival who is 29 years of age has an advantage over him because he's younger and taller than him.

According to him, 'He's a lot younger. When you look at myself and Conor McGregor on paper, he's taller, has a longer reach, he's a bigger man from top to bottom.

'He's a lot younger, so youth is on his side. I've been off a couple of years. And I'm in my 40s. So, if you look at everything on paper, it leans toward Conor McGregor

'I'm older. I'm not the same fighter I was two years ago. I'm not the same fighter I was five years ago. I've lost a step.

'A fighter like Andre Berto isn't even supposed to go the distance with Floyd Mayweather, but remember, I was 38.

'It's obvious I'm slipping a little bit to even let a fighter like that go the distance with me. I'm not what I used to be, he said.

Mayweather, who's favourite for the fight after winning all of his 49 professional bouts, has promised to put his age difference behind to win the fight for his fans.

'This can't be a defensive fight. I have to go to him. I owe the public because of the Pacquiao fight. They weren't pleased with that. They're gonna be pleased with this fight here.'

The American champion will take on the Irish UFC star at the T-Mobile Arena in Las Vegas on Saturday, August 26, 2017.