Jay Deas, the head trainer and co-manager of WBC heavyweight champion Deontay Wilder, is only days away before his boxer makes a mandatory defense against once-beaten challenger Dominic Breazeale.

Wilder will collide with Breazeale on Saturday night, in a Showtime televised main event from the Barclays Center in Brooklyn, New York.

Joshua will make his American debut on June 1, when he defends his belts against Andy Ruiz at Madison Square Garden in New York City.

Should they both win their upcoming fights, Deas expects a lot of pressure from the public to make that unification happen.

"The pressure is so much that, when these guys come through these fights, there will be a renewed charge to make it happen," said Deas to Sky Sports.

"It depends if the powers that be can come together. You've also got Tyson Fury saying: 'I'm also in the mix, I've got a draw with Wilder, I want that again'."

Joshua stopped Breazeale in seven rounds back in 2016, and he views him as a dangerous opponent for Wilder.

Breazeale can punch, and knocked out his last two opponents to land the mandatory fight with Wilder.

Joshua says the challenger is very durable. He managed to hurt him in the second round of their contest and wasn't able to put him away until several rounds later.

"When I looked at his interview after and I saw his face, I said 'wow you definitely took a beating', and he stayed in there. He got hurt in the second round, stumbled, stayed on his feet. [Breazeale should] come game, it's a world championship fight, that's what I'm saying," Joshua said.