Anthony Joshua vs Tyson Fury: 'If either fighter loses their warm-up bout, you cannot do the fight,' warns Eddie Hearn

The richly anticipated Anthony Joshua versus Tyson Fury showdown could still be derailed if either man loses a tune-up bout beforehand, says promoter Eddie Hearn.

Both Joshua and Fury have signed to fight each other later this year. But AJ will have a comeback bout on July 25 in Saudi Arabia and Fury is looking to have a tune-up contest of his own in the summer.

Neither can afford to lose either of those fights. If they do - "it's over," says Joshua's promoter Eddie Hearn.

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"In my opinion if either fighter loses, you cannot do the fight," Hearn told Sky Sports.

"I will feel sick at the ringwalk on July 25. Especially with what AJ's come back from. I mean there is that worry. Will he be the same? Everything we see in camp and in sparring lends us to suggest yes. But there's a lot to overcome. That's the importance of this fight as well in July."

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He added: "Now we have signed to fight Tyson Fury. He has signed to fight Anthony Joshua. The only thing that stands in the way is July 25."

Joshua and Fury did not face off after the latter's comeback win over Arslanbek Makhmudov. But the promoter hopes Fury will be in attendance for Joshua's upcoming fight against Kristian Prenga.

"I'd be shocked if he wasn't in Riyadh July 25. Because that's the moment," Hearn said. "They've never come face to face. When they come face to face for the first time, it will give every sports fans the shivers. Because this [fight] is something they will never forget."

Hearn is open to Fury having his warm-up on that same bill as Joshua in Riyadh.

"We don't have a problem with that. That's down to Turki [Alalshikh] to see where he wants to land. It might be difficult for Fury to go underneath Joshua on that card I don't know," Hearn noted.

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"I don't think he [Fury] is going to be having a fight of any significance, even not the likes of Makhmudov. I don't even think they'd have a fight at that level. They've got to do what they've got to do. They've just had 12 good rounds and we look forward to hopefully less rounds than that but going through the gears and warming up for the big one.

"I think everybody's extremely focused, now that both fighters have signed, on just getting through the next couple of months and making sure we can give the world this mega-event."

Joshua's fight with Fury is earmarked for November but the date and venue have not been set yet. It's hoped it will be staged in the UK, though the location is currently unconfirmed.

"It's down to Turki. He understands the magnitude and the importance of this event in the UK. But also he's paying the bill," Hearn said.

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"We know that it's a blockbuster event in terms of its numbers. I would love to do this fight in the UK and I think he would too so if there's a way for it to be done I think that would be everybody's preference."

British stadiums like Wembley, the Tottenham Hotspur ground or Cardiff's Principality Stadium, with its roof, could all be good fits for the fight.

"We did Benn-Eubank in November [at Tottenham]. You are playing a bit of roulette [with the weather]. But the Millennium Stadium is a tremendous venue," Hearn said. "They'll also be looking at the numbers thinking about the business of the show as well.

"You know it's going to sell out any stadium instantly anywhere in the world," he continued. "It's also iconic in our country. We'll see.

"When these two square off in the ring it will be the single biggest sporting event you have seen in this country."