"I know that sounds crazy, because he's a Super champion, but I see so many chinks in his armour.
"There is nothing he does which makes me think I won't beat him.
"I can expose what he doesn't do very well and you'll see what I'm talking about on Saturday night.
"I'm not going to say too much today as I don't want to scare him off.
"I'm coming very fast for you, Wlad. Old guy, young guy. Old champion, new champion. Enough said. Amen," added Fury, ahead of the bout at Duesseldorf's Esprit Arena with 42,000 tickets sold.
Klitschko has heard such bold statements before from previous challengers, many of whom then became one of his 53 knockouts in 64 wins.
Britain's David Haye labelled the champion a "large, slow robot from the Ukraine" before losing emphatically on points in Hamburg in July 2011.
The last of Klitschko's three defeats was back in 2004.
"There have been many fighters I've faced, this time I face a guy who's young, a real challenge," Klitschko said.
"It's going to be a great night. Having previously said the eccentric Fury has "screws loose", Klitschko said he will give the Mancunian his own brand of "therapy" in the ring.
"I believe he is insane," said Klitschko, who is nicknamed "Dr Steelhammer".
"He's a patient who urgently needs therapy. And the boxing ring, the fight, is the best form of therapy.
"I'm a doctor and I'll rescue you."
Fury stirred up controversy earlier yesterday in a BBC interview by claiming boxing has a "big problem" with doping.
He suggested that the sport should tackle the issue by legalising banned substances.
The British fighter said he hopes the World Anti-Doping Agency (Wada) has tested both boxers stringently.
"Wada have tested me very regularly, sometimes three times in a month," Fury said.
"Hopefully he'll have been the same."
Klitschko dismissed the issue, stating: "I've been tested a lot, over a quarter of a century."
- AAP
