Anthony Joshua has been tipped to become Britain's number one superstar if he manages to beat Wladimir Klitschko this weekend at Wembley. 

The contest is set to take place in front of 90,000 at the capital on Saturday in the biggest ever fight on British soil, said to be worth up to £50million.

Promoter Eddie Hearn has claimed that Joshua could go on to surpass the likes of Andy Murray, Lewis Hamilton, and Wayne Rooney as the best sports star in the country if he manages to unify the WBA and IBF heavyweight titles. 

With endorsement from top brands and banners across the world in places such as Dubai and Los Angeles, Joshua has already become a global presence.

“I believe victory on ­Saturday will make him the biggest star in British sport and probably the biggest star in world boxing,” said Hearn. 

“That’s the pressure. I don’t think he’s out there to be that person, he’s out there to win a fight.ut he’s smart enough to know what comes with it and he’s fighting for that, as well as the legacy.

“He’s got multiple ­commercial partners, his profile is incredible and the brands supporting him are partly responsible for that.

“You can’t be in a key market without seeing a billboard of Anthony Joshua. He’s in Dubai, ­Los Angeles, Germany – he’s everywhere. But we’re only scratching the surface.”

Hearn also feels that the Joshua cannot afford to go back to arena fights following Saturday's massive showdown and plans for international expansion is already underway. 

"How does the journey evolve? It evolves through fighting in different ­markets,” said Hearn. "It’s the only way it can do.

"You can’t keep fighting in England for 10 years, so the ­challenge will be to break down barriers and find new markets, whether it’s Africa, the Middle East, the Far East or America.

"He probably can’t go back to arena fights in the UK because it’s like any job — how can you earn what you’re going to earn on ­Saturday and then take ­another fight for a third of that amount?

"Who could be next? You have to look at Deontay Wilder, ­Joseph Parker, and Tyson Fury."

Klitschko has attempted to unsettle Joshua ahead of the big fight, saying that the Brit is too young to handle the pressures of such an encounter but Hearn has rubbished such claims. 

"I've never seen a fighter so calm as Anthony, going into a fight like this — I’m the one who’s nervous and petrified," he said.

"Wladimir is doing all he can to get into Anthony’s head, but Anthony doesn’t really do mind games.

"I believe if Anthony can remain in the same mindset as he is now, then I’m very confident about victory."