"Dereck is young and has only had 14 fights but that doesn't say a lot. The fact he's confident says a lot, his will says a lot."
However, the 34-year-old Klitschko, who has had 58 professional fights to the British and Commonwealth champion's 14, changed his tune after the challenger made light of his boxing skills.
"You say I have no boxing skills, you say it's going to be rough and tough," stated Klitschko, whose older brother Vitali is the WBC title-holder.
"Maybe you consider me a bum in boxing. Well, good luck - I will make you eat your words, I love to do paintwork on your face."
Chisora's opportunity came after talks between Klitschko and Haye, who defends his WBA belt against Audley Harrison next month, broke down because of differences over money.
Chisora has been tied into a three-fight deal, meaning he will have to fight Vitali in Germany next if he wins in December and Wladimir again if he beats Vitali.
"We're going to do a treble, all in Germany - Wladimir, then the older brother, then the younger brother, and then we'll come back to London and try and get David Haye out of retirement," said Chisora.
"I am more hungry than any other fighter he [Wladimir] has boxed. I want it more than he wants it. It's not going to be a boxing match, it's going to be a fight.
"I'm going to take him out of his comfort zone. I didn't expect it to come as early as this. The opportunity has knocked on my door and I took it."
However, the 6-1 underdog's dreams might be dashed because he is due in court next month for sentencing on theft and assault charges.
The Zimbabwe-born fighter must appear before the City of Westminster Magistrates' Court on 10 November, four weeks before he is scheduled to meet Klitschko.
Last Friday Chisora pleaded guilty to the offences which took place on 28 May. A pre-sentence report is being compiled.
Assault alone caries a maximum penalty of six months in prison and/or a fine.
However, a source involved in the fight's promotion does not expect the court appearance to have an impact on the staging of the contest.
Last year Chisora was banned for four months and fined £2,500 for biting opponent Paul Butlin on the ear.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.