Retired undisputed world heavyweight champion Lennox Lewis thinks that current title holder Wladimir Klitschko will knock out challenger Tyson Fury during their scheduled 12-round bout at the Esprit Arena in Düsseldorf, Germany on Saturday.

"If Tyson Fury doesn't have an answer for Klitschko's jab - he's going to have a problem and he's going to get knocked out," the 50-year-old retired fighter said, as per Boxing Scene.

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Lewis, who is Fury's compatriot, believes that the 39-year-old Klitschko, who had never been defeated in the past decade, is more powerful and more technically sound than his young opponent.

He said that while the fight is "interesting" as both boxers were "basically the same size", Klitschko is much superior in skills to Fury more than a lot of people can realize.

The Briton legend also criticized the 27-year-old Manchester native for his verbal tirades during the build-up for the fight, saying that "Fury needs to put his money where his mouth is by proving his boasts in the ring."

Fury had called Klitschko different names and also ridiculed the Ukrainian's fighting style during the fight's promotional press conferences. This was actually effective in drawing interest to the world title matchup, but not in intimidating the champ.

"Klitschko is the champion right now. Who is Tyson Fury? He has to prove himself. All of these antics and stuff doesn't make him a good boxer, all it does is makes him a good showman," Lewis said.

Meanwhile, TalkSport reported that Lewis said that Klitschko has to beat current WBC world heavyweight champion Deontay Wilder for him to be "considered on his level".

"He must have all the championship belts," said Lewis. "I had them all."

Lewis ended by saying that Klitschko should do it as soon as possible as his "biological clock is ticking", which is perhaps the greatest opponent all legendary boxers have ever faced.

Tags Boxing News, Boxing Rumors, Boxing News & Rumors, Lennox Lewis, Wladimir Klitschko, Tyson Fury, Wladimir Klitschko vs Tyson Fury