Alex Krassyuk, the promoter of former undisputed cruiserweight champion Oleksandr Usyk, is confident the boxing world will see a major upset next month, when his star fighter challenges WBO, IBF, WBA, IBO heavyweight champion Anthony Joshua.

Their fight will take place on September 25th from the Tottenham Hotspur Stadium in London.

Usyk has won some of his biggest fights in the UK - a successful run that his promoter fully expects to continue.

"Usyk has absolutely no problem fighting in the UK – he became the European Champion in Liverpool, Olympic champion in London, he beat Tony Bellew in Manchester, he beat Dereck Chisora in London – so he has lucky experience there and that will continue in September," Krassyuk told MyBettingSites

"Oleksandr is very confident in his victory over AJ and how he will beat him - so therefore he easily agreed for the second bout because his mindset will be even more favorable after he wins the first."

There are a lot of critics who believe Usyk is too small for the heavyweight division.

He won a much tougher than expected decision last October with heavyweight veteran Derek Chisora.

Krassyuk disagrees with the critics who are focusing on Usyk's size.

"I must say for those who do not see the clear reality that Usyk is a heavyweight - Oleksandr is the same size, weight, reach as his idol, “The Greatest” Muhammed Ali. Can anyone say Ali, the best of all time, was not a true heavyweight? So there is no problem there, if Ali can be beat the best at that size, so can Usyk," Krassyuk said.

"For AJ we wish him only the best, we wish him a wonderful training camp with no injuries or any other troubles. I respect him so much for his achievements in boxing, for his humble behavior, being such a massive star, for his bright personality. But let the best man win in September and then we will do it again in the rematch."