Klitschko's record now stands at 64 wins to five losses.
Joshua, 27, stopped Klitschko in the 11th round of Saturday's Wembley super-fight to add the vacant World Boxing Association and International Boxing Organisation titles to his International Boxing Federation crown.
"Ultimately from the U.S. perspective, the ultimate destination would seem to be - at some point in the next year hopefully Joshua versus Wilder", said Espinoza, who has worked with the likes of Floyd Mayweather.
Fury won a unanimous decision over Klitschko back in November 2015 and still has to wait to see if the British Boxing Board of Control returns his licence at a hearing next week. Fury subsequently vacated the WBA, WBO, and IBO titles in 2016 because of medical issues and it's believed he will make his comeback on 8 July against Avtandil Khurtsidze in London.
The win saw Joshua receive £15 million, but the future could see a lot more for the Watford-born fighter.
Joshua - who grew up on the Meriden estate - joined the club to avoid some "trouble on the streets", though Mr Murphy said he rarely had any trouble with him, only occasionally having to stop him chatting to other boxers. "It would be nice to fight a real villain".
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Fury admits he was impressed with Joshua's recovery after the sixth-round knockdown at Wembley - the first time he'd hit the canvas in his professional career - but is confident it will be a different affair when they face off. "There can only ever be one heavyweight, especially in our part of the world, and it's me".
"He'll have a couple of weeks to see what his future holds but I think Wladimir is lifted by the respect that was given to him not only by the fight community but also by fans around the world".
"I've been following fights since I was nine years old and it (Joshua-Klitschko) delivered on all fronts".
Anthony Joshua is now the biggest sports star in Britain - and is heading for global superstardom. "I need to be a billionaire".
Joshua's promoter, Eddie Hearn, has already made it clear that a Joshua vs. Fury fight is not even close to take place in 2017. He could easily be the first billionaire in boxing.
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