Former world champion and Sky Sports expert analyst Carl Froch is salivating to see a heavyweight unification between IBF, IBO, WBA champion Anthony Joshua (20-0, 20 KOs) and WBC champion Deontay Wilder (40-0, 39 KOs).

This coming Saturday night, Joshua will collide with WBO champion Joseph Parker at the Principality Stadium in Cardiff, Wales.

Wilder was scheduled to be at ringside, but he changed his mind after both Joshua, and the promoter Eddie Hearn, refused his request to enter the ring in the aftermath to do a face to face with Joshua.

Froch believes the pressure is now in full swing to see Joshua collide in the ring with Wilder - next.

Joshua appears to be content with allowing the possibility of the Wilder fight play out a little longer.

"I don't really understand why 'Josh' just disregards him, he seems to be happy to keep him waiting. Wilder is the one. The one we want to see him in with and the fight he needs to win," Froch said to Sky Sports.

"There is always pressure on Joshua but thanks to Deontay Wilder, there is even more this time around. A lot of people are asking questions. Is he coming over? When is he going to fight 'Josh' and if not, why not? All of a sudden, there is someone out there who is smashing people to bits and looking fantastic doing it.

"Wilder is exciting. He has explosive power, he is awkward, he is dangerous and when he's got someone hurt he doesn't let them off the hook - unlike Wladimir Klitschko. Regardless of what he says and puts out there, Wilder is big and scary and trust me, when 'Josh' and Rob McCracken sit down and watch a Deontay Wilder fight, they will know - 100 percent - that it is a very dangerous fight."

Froch was very impressed with Wilder's most recent win.

Earlier this month, Wilder found himself in serious trouble during the seventh round of his seventh defense - but he battled back and scored a tenth round knockout over undefeated Cuban puncher Luis Ortiz at the Barclays Center in Brooklyn, New York.

"There is a lot of heat on Josh. I said I wanted Wilder to make him and Rob sweat a bit against Ortiz and he did just that. But now with the world watching him, another sold-out stadium all there to see him, against another world champion? The heat is definitely on," Froch said.

"Josh has to beat Parker, but this one is also about how he wins it. He really could send a message out to Wilder. Parker is unbeaten, a world champion - something Wilder hasn't faced - and if he does the job and looks really classy doing it, either in points or by smashing him to bits, that not only sends a message, it also takes the pressure off him."