Tony Bellew believes his former opponent Oleksandr Usyk can become world heavyweight champion by challenging Deontay Wilder – but warns that he won’t beat everybody in his new division.

I AM USYK!馃憗馃憗@usykaa makes his eagerly awaited heavyweight debut this weekend… are the big men ready for him? 馃嚭馃嚘馃挭

— Sky Sports Boxing (@SkySportsBoxing) October 10, 2019

Usyk knocked out Bellew last year to defend his undisputed cruiserweight title and, on Saturday night at 2am live on Sky Sports Action, debuts as a heavyweight against Chazz Witherspoon.

Bellew believes Usyk can achieve his goal of becoming world heavyweight champion if he targets WBC holder Deontay Wilder.

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Do's鉁匨aintain speed鉁匯ely on defenceDon'ts鉂孊ulk up with muscle鉂孖gnore the threat of injury@MrDavidHaye tells @Usykaa HOW TO BECOME A HEAVYWEIGHT:

— Sky Sports Boxing (@SkySportsBoxing) October 8, 2019

What are Usyk’s strengths and weaknesses?

Tony Bellew said: “Being in there with him you notice straight away that he’s always doing something and making you think every step of the way. His footwork is unbelievable for such a big man, and it’s his feet that get him into position for attacks.

“For his weaknesses, I still think he’s a little bit open and can be caught. Watching his amateur fights, there was always a reaction from him when he got caught clean, but no one has exploited that so far in the pros. His chin is up in the air sometimes and if that continues then it might get caught one time.”

What did you struggle with most when you fought him?

Tony Bellew said: “Pinning him down was hard because, as I’ve said, his footwork is just on another level. I’d planned to get close and really work him over, but any time I tried to make a fight out of it, he was just too elusive. His feet will get him very far in this sport, and the way he feints and sets up attacks is also impressive.”

How can Usyk be hurt?