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Fury and Joshua's highly anticipated super-fight seemed all but confirmed after a deal was struck for the bout to be held in Saudi Arabia on 14th August.
But the unification showdown has now been plunged into doubt after the Wilder camp recently won its arbitration case against Fury.
Wilder activated his rematch clause against the WBC champion after his devastating defeat to his Brit rival last February in Las Vegas.
However, the third fight in the trilogy was postponed amid the coronavirus pandemic before Fury claimed that he had 'moved on' from facing Wilder in a rematch.
Wilder hasn't fought since his one-sided beating at the hands of the Gypsy King and he has parted ways with former co-trainer Mark Breland after a messy split.
The 35-year-old ex-WBC champion has since enlisted the services of Malik Scott, who he knocked out in the first round of their 2014 clash.
Scott claimed that Wilder turned down "step-aside money" and insisted that the Bronze Bomber is out for "blood."
The 40-year-old American wrote on Instagram: "Wilder declined and had no interest in step-aside money. Y'all dealing with a whole different type [of] motherf****r over here.
"He want [sic] the blood, not that step-aside money. 'Retribution is upon us.'"
Frank Warren claimed that it could take a hefty $20m fee to tempt Wilder from stepping down from his third fight with Fury and to ensure the unification clash takes place next.
Fury's co-promoter told BBC Radio 4: "Until we can reach an accommodation with Deontay Wilder's people, I can't say that [Fury vs Joshua] will definitely happen.
"But we are working hard to get that over the line. We were talking last night and hopefully we can do that.
"If not then Tyson, if he wishes, will go to the fight with Wilder. They're the only two options...
"There is a cut-off point one when a decision has to be made and which direction Tyson goes in. I hope Deontay will accept less than $20million."
Fury, who hasn't fought since his victory over Wilder, took to social media on Wednesday and launched a scathing attack on his fierce rival's long list of excuses over his defeat last year.
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