It comes off the back of the Gypsy King’s crossover clash with ex-UFC champion Francis Ngannou, 37, in Riyadh.

Fury was astonishingly floored by the boxing debutant and deemed fortunate to walk away with a controversial points win.

It has left Zhang, 40, questioning the unbeaten WBC champion’s mindset heading into the historic undisputed title decider.

He told The Metro, via Freebets.com: “I think it is simple, Fury didn’t train for this fight [against Ngannou].

“To be honest with you, he is not the version we are used to seeing.

“I can see his mindset is not in boxing at the moment, he is doing commercial things, he is doing PR, marketing, different things, but not boxing.

“And in this business, you can’t really fool yourself. You can’t fool training.

“After the fight [against Ngannou] in his press conference and interviews he said he had a good training camp for that fight.

“If that is the case, he has a very big problem going into the Usyk fight.”

Despite Zhang’s blast on Fury, he hopes the British superstar leaves Saudi with all the belts so he can challenge for them.

He said: “I hope it is Tyson Fury.

“And I want to tell him: My brother, train hard and do the right thing and get four belts and give them back to me when I see you in the ring.”

Zhilei Zhang wants to fight FuryCredit: Richard Pelham / The Sun