Wladimir Klitschko has vowed to teach David Haye a "lesson" in their heavyweight unification bout on July 2.

The Englishman labelled his opponent a "fraud" at the Imtech Arena press conference but the Ukranian chose a different tact.

"I really respect you and you are a fantastic fighter with an impressive record," he said.

"I believe it will be a pretty good lesson in respect on July 2."

The Ukrainian then spoke of Haye's fondness of using Twitter, and suggested he post something onto the social networking site ahead of the fight.

"David Haye has been tweeting. He has a lot of followers," he said.

"Please tweet 'Wladimir said David Haye is going to be my 50th knockout'."

The 35-year-old Ukrainian added: "He has to have 50% which I dont think he deserves, so I gave in and gave 50% otherwise it wouldn't have happened."

Haye spent the majority of the press conference questioning the ability of his opponent, but Klitschko has moved to praise Haye's prowess in the ring.

He said: "I want to show respect to him, which may surprise you but he has certain qualities.

"He has heavy hands and great speed as well as being motivated and this time the steam came out of his ears because suddenly he has this anger and I think I will be challenged in the ring."

The Imtech Arena in Hamburg will host the fight but the British support for Haye is still expected to be strong and Klitschko has been impressed by their attitude.

"British fans are amazing because I have been to fights in the US where British fighters are involved and they are singing songs and really loud," he said.

Haye, 30, suggested Klitschko's confidence may prove to be misplaced.

"He's had a long run and if he's been reading his own press then maybe he is confident, maybe he does believe he is invincible," he said.

"I've lost a fight, the better man (Carl Thompson) won on the night. I've learnt from that and become a champion - he's lied about why he's lost, blaming it on someone drugging his water or putting a substance in his Vaseline.

"Someone looking for excuses is someone who's going to get knocked out. A referee that can count to 10 is all I require."