Anthony Joshua

Joshua retained his IBF crown and gained the WBA and lesser-regarded IBO belts by stopping Klitschko in the 11th round of an epic battle at Wembley Stadium in April.

The champion is awaiting a decision on the second bout from the 41-year-old Ukrainian, who hinted at retirement following just his fifth career defeat in London.

Promoter Eddie Hearn has held discussions with Klitschko's manager Bernd Bonte and feels a Las Vegas bout could be the key to locking the fight in, though Nigeria, Dubai and Cardiff are also in the hosting mix.

Joshua added the WBA and IBO belts, vacated by Fury who is without a licence amid a hearing into alleged anti-doping offences, to his IBF strap with a thrilling 11th-round TKO of Wladimir Klitschko.

He said on Tuesday that Fury is top of his list and his British compatriot, who claims he is still the lineal champion, duly responded to those comments, saying in an Instagram post that "the world wants to see it" but that he does not believe Joshua can lace his boots up.

Joshua, 27, knocked out Wladimir Klitschko in May to add the WBA title to the IBF strap he already held.

But Tyson - a two-time world heavyweight champion - has warned the position can be "a crown of thorns".

In a wide-ranging interview with BBC Radio 5 live boxing's Mike Costello, Tyson outlined his belief in Joshua's ability, gave his views on a potential Floyd Mayweather-Conor McGregor bout and offered insight into the man who turned him into the youngest heavyweight champion in history.

Joshua extended his professional record to 19-0 with an epic knockout of Wladimir Klitschko at the end of last month, calling out Fury in the ring in the immediate aftermath.

Fury (25-0) has not fought since defeating Klitschko in Dusseldorf in November 2015 and is currently without a licence, while he has struggled with mental health problems and faces a UK Anti-Doping hearing on Monday over claims he tested positive for a banned substance in February 2015.

Joshua retained his IBF heavyweight title and claimed the vacant WBA and IBO straps with an 11th-round stoppage of Klitschko in front of 90,000 fans at Wembley.

The Briton sent Klitschko to the canvas in the fifth round but appeared set for defeat after the Ukrainian knocked him down a round later.

However, the unbeaten Joshua recovered and hit Klitschko with a penultimate-round barrage that sent the 41-year-old to the deck twice more before the referee called a halt to an enthralling contest.

Joshua beat Wladimir Klitschko in the 11th round at a sold out Wembley Stadium at the weekend to win three of the four heavyweight titles that belonged to Fury, who relinquished all of his titles in 2015 after his license was suspended pending investigation for doping and medical issues.

The heavyweight rivals have been talking about a match-up since last week when they exchanged barbs on Twitter and Fury challenged Joshua after his victory at Wembley, saying he "can beat AJ with one arm tied behind my back".

Joshua successfully defended his IBF title, while also claiming the WBA 'super' belt at a sold out Wembley courtesy of a dramatic 11th-round stoppage, after the Brit had been flattened in the sixth.

Sky Sports reports Parker had been due to defend his own title against Hughie Fury in Auckland on May 6, but the unbeaten Brit was forced to pull out due to a lower back injury.

The 25-year-old Kiwi will now face Romanian Razvan Cojanu on the same date, but admits after that clash he will look to arrange something with Joshua.

Both men had to climb off the canvas in an 11-round epic in front of 90,000 at Wembley, but Joshua had the lasting power to pummel Klitschko late on and add the WBA title and less revered IBO belt to his IBF crown.

Klitschko recovered from tasting canvas in the fifth to send Joshua to a first career knockdown a round later, although the Ukrainian veteran could not capitalise and the Brit was able to recover ahead of his late onslaught.

IBF champion Joshua can add the WBA 'super' title with victory over Klitschko in Saturday's heavyweight unification clash, live on Sky Sports Box Office.

A record crowd of 90,000 will attend the fight, which will also be watched by a worldwide audience on television, and Hearn believes the unbeaten 27-year-old could soon be recognised as the most marketable figure in the sport.

"He becomes the biggest star in British sport and the biggest star in world boxing," Hearn told Sky Sports. "It's early in his career, it's his 19th fight, so masses of pressure."

Klitschko, who is entering his 29th world title fight, revealed on Thursday he has made a video of his prediction for their heavyweight bout at Wembley.

That has been saved on a memory stick which will be sewn into his robe.

"It's strategy," said Joshua, 27. "An attempt at a mind game. I didn't take it the way he wanted to express it."

Former heavyweight champion Klitschko, 41, will auction his robe - and its contents - for charity after the Wembley Stadium super fight for Joshua's IBF title and the vacant WBA belt.