Andreas Kotelnik has vowed to take his annoyance out on Amir Khan after being refused entry into the United Kingdom.
The WBA light-welterweight champion fights Khan on 27 June and had been due to promote the fight this week, but failed to gain a relevant visa in time.
"I will knock Amir Khan out on 27 June as I am so annoyed right now," said the 31-year-old Ukrainian.
"Khan is a good ambitious fighter but I am a world champion and I will show my class against this child."
Kotelnik, who is now in Dusseldorf, added: "Khan, like me, has won a silver medal at the Olympics and we were beaten by the great Mario Kindelan. But that is where the similarity ends."
But 22-year-old Khan, who has suffered one defeat in a 22-fight career is confident that he can beat the Ukrainian opponent at the O2 Arena in June and emulate his heroes and become a world champion.
"I am confident I can do a job on him," said Khan.
"I have got fast feet and fast hands and if I box him cleverly, I think I can make it an easy night and a night I can become world champion.
"The Olympics have been the biggest thing for me up until now - but this would be bigger. When I was a kid I always wanted to be a world champion.
"I watched Ali, Prince Naseem Hamed, Ricky Hatton win world titles and I wanted to achieve what they achieved."
Khan suffered his only defeat, a first-round knockout by Breidis Prescott, in September 2008.
Since then Khan has linked up with revered trainer Freddie Roach and has noticeably changed his style in the time he has spent with the American.
A greater emphasis on defence has become one feature of Khan's revamped style under Roach.
"So much has changed from that defeat. I changed from a boy into a man," said Khan.
"There were times when I would just go in the ring and fight but the Prescott defeat taught me in the right way. If I had gone into that fight and boxed with my mind it would have been a different night.
"Things happen for a reason. I have changed so much since that defeat. I am now in LA (working with trainer Freddie Roach) and a world title shot has come along.
"I fought Oisin Fagan and then beat Marco Antonio Barrera. People said Barrera got cut but I always knew I had the skills to beat him."
Kotelnik, who has a record of 31 wins from 34 fights with 13 knockouts, two defeats and one draw, claimed the title after beating Welshman Gavin Rees with a 12th round knockout in 2008.
He hopes to sort his visa out in time to face the Bolton fighter in June.
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