SunSport revealed in April that Saudi Arabia want to stage a £325million twin blockbuster with the heavyweight stars.
Watford ace Joshua, at the Austin track for last night’s US Grand Prix, declared: “They want to put Usyk-Fury, Joshua-Wilder on the same night.
“That might not happen until April.”
A deal for a unification fight between Britain’s undefeated WBC champ Fury, 35, and WBA, IBF and WBO king Usyk, 36, was signed in October.
That is set to take place in Riyadh.
Terms have also been agreed for ex-world champ Joshua to fight American Wilder.
However, no date or venue has been set for that clash.
And AJ added: “The next window will be in March-April, so that’s probably when the undisputed fight will happen.
“What we are being told is they want to make it a mega card and they like the sound of Joshua v Wilder on the same night.”
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Joshua, 34, said he plans to fight this December in London.
That will be against an unnamed opponent before taking on Wilder.
AJ said: “I’ve got to stay busy.
“I’m not listening to all the noise about Wilder and these guys.
“When the opportunity comes, we will be ready.”