Oleksandr Usyk turns to animal analogies to explain why he has no fear being in the land of the giants.

The Ukrainian superstar is an Olympic champion who conquered the cruiserweight division as a professional.

But now the 6ft 3in slick switch hitter wants to use his amazing talents to dominate at heavyweight where man mountains Anthony Joshua and Tyson Fury currently reign as kings.

The next step on that journey is taking on Derek Chisora tomorrow night at Wembley Arena.

Both Joshua and Fury regularly tip the scales well over 17st but Usyk weighed in for his second fight in division at 15st 7lb.

Oleksandr Usyk turns to animal analogies to explain why he has no fear being in the land of the giants

He will give away almost three stone to the bulkier Chisora and his size disadvantage has cast doubt over whether he can take on the big boys currently in possession of the world titles who are as big as 6ft 8in.

“You know history, David and Goliath? Yeah, that’s first,” said the 33-year-old unbeaten Kiev native.

“Second of all, if the tsar (king) of the animals would be by weight and by size, it would be the elephant. But now it’s a tiger.”

Usyk takes on Derek Chisora in his second contest up at heavyweight on Saturday night

Usyk points to the orange tracksuit he is wearing to make it clear he is the one wearing the colours of the tiger and then laughs maniacally.

There seems little worry from his friend and fellow pound-for-pound star Vasiliy Lomachenko showing he isn't invincible when he lost his unbeaten record to Teofimo Lopez two weeks ago.

“He didn’t lose,” said Usyk. “He’s just going to change his ammunition and he’s going to go back stronger. You don’t even understand how strong he is.”

But the Ukrainian insists Chisora's superior size will not play a part in the fight

Both are freakish talents sculpted by years in the regimented training camps of Ukrainian amateur boxing.

But Usyk, even without English, seems a more colourful character than his compatriot.

At the final press conference on Thursday here in London, he preferred to solve match equations on a piece of paper than listen to Chisora's pre-fight ramble.

While he has become a hit on social media by calling out Chisora constantly while all week in the hotel he has been happily mingling and making jokes with those also within the bubble.

He preferred to solve match equations on a piece of paper than listen to Chisora at the pre-fight press conference

He lives on the outskirts of Kiev with his collection of animals which includes horses, cattle and his German Shepherd called Mr Grey.

“Like six months ago I moved out of town to a private house and somebody gave me a present: a dog,” he said.

“My oldest son wakes up, the very first in the family right after me. I wake up, then him.

“So we do 30 minutes exercise every morning together.

“After that, the rest of the family wake up – my wife and then we have breakfast.

Usyk was an undisputed champion down at cruiserweight

“Then we take the dog, we go for a walk. Sometimes it can take hours, two hours, we don’t do anything.

“What is he called? Grey. Mister Grey.

“Why? I don’t know. It’s the best dog.”

Usyk is the mandatory challenger for Joshua's WBO title and believes he should get his shot next if he overcomes Chisora tonight as expected.

He is the mandatory challenger for Anthony Joshua's WBO heavyweight title

But Joshua only has eyes for Fury if he beats Kubrat Pulev in December.

So what does Usyk think about the pair ignoring him in favour of a mega-money showdown between each other.

“They joke,” he added.

Then laughed maniacally again.