“He chose to fight me. I am going to have to eat some leather. I’m going to have to take his power punches. But then he will have to eat my leather because I will go in there to do what I need to do.

“It is going to be a bit of a shock to him, because he is a cruiserweight coming up. We will have to look to see if he has the power as a heavyweight. When I land, he will know about it.”

At 36, this is probably Chisora’s last shot at the big time. While Usyk is undefeated, Chisora has lost six times. If he pulls of the upset and inherits Usyk’s No 1 position with the WBO, he says he is willing to step aside to allow a Tyson-Fury-Anthony Joshua fight “if Eddie Hearn comes with big numbers”, but he believes a training regime that never stopped when lockdown happened and the fight was postponed from an original date in May has him in the right place to win.

“I have been training for about nine months for this fight,” Chisora said. “Looking at the board in the gym I have had one week off since I boxed David Price (last October). 

“I think I have got more patient with what I did. I didn’t have any breakdowns, my body is performing at 100 per cent. When everybody else was in lockdown, my gym was only just for me.

“There is nothing more I can do. We have trained for eight months and I have got everything right. I knocked out all my sparring partners. We offered £2,000 for any southpaw who could knock me out. But no one has come and tried to knock me out, they have all ended up running out of the gym because they can’t handle the power and the pace.

“I trained every day during lockdown for an hour and when the lockdown ended I trained in the morning for an hour and the evening for an hour. But I had to train hard. If you train hard for three hours, you can’t train hard the next day.

We did two weeks of sparring, back-to-back every day. Then we did a ‘hell week’ where is was all cardio. Then we went back to two weeks of sparring. We would have five guys in the gym, one would come in, one would come out and I would stay in there. You have to go to the other side, most fighters don’t want to go there.”

The lack of fans could be a blow to Chisora, who has used the crowd for motivation in the past, while he has looked lethargic in a less boisterous atmosphere, most notably with a lacklustre effort when losing in a European title fight against Agit Kabayel in 2017 in Monaco. 

He says he has prepared for the lack of atmosphere by ensuring there is no music in the gym when he trains, but a sterile atmosphere could suit Usyk better, who is used to winning on the road.

“The closest I ever came to boxing behind closed doors was when I boxed in Monaco,” Chisora said. “It is going to be hard for both of us.

“It’s a big fight but the fans are not there to cheer me on. This is giving people a bit of hope, because people are talking about this and forget about their problems for a split second. I’m trying to bring entertainment to their homes.

“If the fight gets good numbers, it is because of me, not because of him. I’m in great shape, my mind is bright, I’m just happy I am fighting this year, because there is so much going on in the world right now.”

For a boxer who has a press conference brawl with David Haye, who is now his manager, and threw a table at Dillian Whyte, Usyk has his respect. Indeed, Chisora says he is a bit of a fan of the former undisputed world cruiserweight champion.

“This guy is a good guy, there is nothing bad about him,” Chisora said. “He won a gold medal, he has beaten everybody who has been put in front of him. For me to say anything bad about this guy just makes me look stupid. I can’t saying bad about this guy, he’s done it all, a good fighter, he’s not done anything wrong to anyone, he’s a good athlete. 

“I just want a fair ref, because the last time I was in a big fight against Dillian Whyte, he took points away from me and I ended up chasing the fight and I got knocked out. I want fair judges and a fair referee, that’s all I am asking for.”

Ron Lewis is a senior writer for Boxing Scene. 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.