Chisora lost two of his last three fights, against Tyson Fury and Robert Helenius, but still managed to set up a fight against Klitschko next month, perhaps at the expense of London rival David Haye, who wants to come out of retirement to fight 'Dr Ironfist'.
Critics have been lining up to ridicule any hopes Chisora has of beating the 40-year-old Ukrainian, who, along with brother Wladimir, has dominated the heavyweight division for the best part of a decade.
But Chisora, who is six inches shorter than his opponent and has a physique which is nowhere near as chiselled, is not concerned that the boxing world has already given him no chance of winning the bout, which will take place in Munich on February 18.
"I don't care what people think," said Chisora.
"They are not the ones who are going in to the ring.
"I am the one who is doing the fighting so I will decide what happens."
Chisora concedes that he is taking a gamble by accepting a fight against Klitschko, but he believes he has something different to the 11 men that have tried and failed to overcome the Ukrainian since he lost to Lennox Lewis in the United States in 2003.
"Vitali has been around a long time. He is the king of the sport but it's about time that somebody came in who is young and fresh and I am going to whoop his ass," Chisora said
"A lot of people have tried to stop him but they don't have the swagger and the passion to go in there and do the business that I have got.
"I am not scared. That's why I am going to be successful.
"Everyone is saying it's going to be the biggest fight of my career but that's just because he has been on the throne for such a long time. "Maybe this will be the toughest test of his career."