IBF and WBA ‘Super’ heavyweight champion Anthony Joshua has urged WBC king Deontay Wilder to be realistic as the duo try to agree a fight for 2018.

Both camps have started talks about a unification fight next year after the duo won their latest title defences.

Joshua defended his titles against Carlos Takam in Cardiff in October while Wilder cruised past Bermane Stiverne at the start of the month.

Joshua’s promoter Eddie Hearn has held talks with Wilder’s camp and Joshua has now told his American rival to be careful with his demands.

He told Dubai Eye 103.8: “I’ve always handled my business with negotiations behind closed doors. When things are done, I’ll announce them.

“I am not in the business of making promises that I can’t fulfil. I am working on getting this fight done.

“Providing Deontay Wilder is true to his word this fight will happen in 2018. It is simple business.

We have worked with all-time greats like [Wladimir] Klitschko. We have managed to defend this title five times.

“If they are realistic about what they want, we can definitely make this fight happen.”

A fight against lineal champion Tyson Fury is also on the cards,while a David Haye contest is not out of the question.

Haye must overcome Tony Bellew in their rematch on December 17 and an impressive victory could catapult him back up the rankings.

Haye is 1.33 favourite to win, with the draw 34.00, while Bellew is available at 3.30.