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Carl Froch has warned Floyd Mayweather not to let boxing down by losing to Conor McGregor.
The Irish MMA star makes his boxing debut against the pound-for-pound great in Las Vegas, on August, live on Sky Sports Box Office.
Froch admits that he can't see McGregor pulling off a massive shock, but with Mayweather out of the ring since September 2015 he hopes 'Money's return doesn't backfire.
"Anybody who knows anything about boxing doesn't give Conor McGregor a chance," Froch told Sky Sports News.
"I thoroughly expect Floyd Mayweather to win, but he'd better not let the world of boxing down. I hope he wins it for boxing but this is an amazing event and I can't wait for it.
"McGregor's got to land something, a punch, quite hard and hurtful early on to be within any chance but anyone who knows boxing isn't giving him a chance.
"This is a Mission: Impossible."
Mayweather has not boxed since his 49th straight win against Andre Berton in September 2015.
The 40-year-old has admitted that training could be a struggle after so long out and Froch agrees that it could catch up with him.
"McGregor is 29 against a guy who is 40 - a little bit older than me - and he's been retired for a couple of years. You really do 'feel' you're retired, you become civilised and soft and you lose that fighting mentality," he said.
"Floyd has brittle hands, so how is the training camp going to go? I am just looking for some positives for Conor here and Mayweather isn't the Mayweather we know from two, three, four, five years ago when he was the best of the best.
"We are just going to have to wait and see."