British promoters Frank Warren and Eddie Hearn have been bitter rivals for the last few years - and the two promotional entities have a near monopoly on the UK boxing scene.

But they will have to work together if a deal is negotiated for a potential full division unification between WBC champion Tyson Fury (promoted by Warren) and IBF, IBO, WBA, WBO champion Anthony Joshua (promoted by Hearn).

Both champions will have to win their upcoming fights to get that showdown in position to take place.

Joshua is making a mandatory defense against Kubrat Pulev on June 20th in London, while Fury is heading to a trilogy fight with Deontay Wilder on a date in July.

Warren has no issue with sitting down at the table to work out a deal for Fury vs. Joshua - but he does believe Hearn has an ego problem.

"I've never, ever spoken to him," Warren told ESPN . "I know his dad [Barry Hearn] well because we worked together in the past.

"We were in business together in snooker for a while. [Hearn is] doing what he's got to to do but his only problem for me is that he thinks he's more important than the fighters and the fans. At the moment he has this deal going with DAZN in the States which has been very lucrative for him and the fighters' but for all that money he hasn't built a star yet and has to rely on bringing fighters in from other promoters like [Canelo] Alvarez.

"But that's his business and I don't get involved, I just get on with it. I've been around a long time and I don't care what he's doing or what anyone else is doing. I just focus on our shows but he always has something to say about our shows."

He also noted that Hearn picked Wilder to knock Fury out in the rematch - and called Fury a boring fighter on numerous occasions.

"Before the fight he said Wilder was going to knock out Tyson and he previously said Tyson was the most boring fighter ever, so he was wrong on both accounts... to call him boring is unbelievable. My job is to do the best for my guy and if the best for my guy is to work with Hearn or Bob [Arum] as we did... I've got to the best for my guy," Warren said.

"To get this fight on of course we would work with him, I'm not getting married to him, there's nothing in the contract that says I have to like him."