Amir Khan fears that a loss to Kell Brook could destroy his legacy, although he does not believe it will happen.
Khan says he has never worked harder than since teaming up with Brian McIntyre in Nebraska and Colorado for this fight.
“You’re always that one fight away from destroying your whole legacy,” Khan said.
“This is a fight that I could end up losing what I’ve done in my whole career. People will be like, ‘Oh but he got beaten by Kell Brook’. So, I have to do everything right.
“I’m not thinking about losing, that can’t happen. I just can’t see him winning this fight. He has not got the skillset, he has not got the timing and he has taken so much wear and tear in the last few fights, I don’t think he has a chance.”
The switch to join McIntyre in Terence Crawford’s camp proved a bit of a shock to the system, but Khan said he is feeling the benefits.
It is the fourth time Khan has had an American trainer, having previously been with Freddie Roach, Virgil Hunter and Joe Goosen.
“I’ve never trained that hard in my life,” Khan said after being put through his paces at altitude in the Rockies.
“When I went there, they treated me with so much respect and the truth came out that they really respected me as a fighter. They had been watching my fights from the early days, and they told me what they did training in the lead up for my fight with Crawford.
“They even watched my amateur fights to see my style, they studied me inside out. When I heard them say that, I thought, ‘Wow’. Virgil Hunter never sat with me and watched a video.”
Khan also said there was no opportunity to cheat on his training regime.
“There’s not only one coach, there’s three coaches watching you,” he said. “I thought, ‘I need something like this’.
“I need someone always watching me. When I was on the pads, when I was on the speedball, I would have someone watching me.
“When you have that you can’t cheat. Even when I was running I had someone following me in a car.”
Khan says the camp for this fight has seen him rediscover his love for the sport, having not boxed for 2½ years.
But the 35-year-old says that he still has a few other boxes he want to tick before he hangs up his gloves.
“There are still big fights out there for me,” Khan said. “I still want to avenge that loss to Danny Garcia. He’s still boxing and that is a fight I would like.”
Ron Lewis is a senior writer for BoxingScene. He was Boxing Correspondent for The Times, where he worked from 2001-2019 - covering four Olympic Games and numerous world title fights across the globe. He has written about boxing for a wide variety of publications worldwide since the 1980s.