Promoter Eddie Hearn of Matchroom has cautioned that everyone might see different side of Anthony Joshua (20-0, 20 KOs) at the first press conference to announce a heavyweight unification showdown with Joseph Parker (24-0, 18 KOs).
Parker, and his promoter David Higgins, have been verbally assaulting Joshua for several months.
Last year, they held a press conference in New Zealand to present evidence to cement their claim that Joshua has a "glass jaw."
In recent interview, Parker's head trainer Kevin Barry called Joshua the most "overhyped fighter in the world."
Parker and his team are convinced that Joshua is going to get knocked straight out with the first bomb that connects to his chin.
Joshua has been soaking it all in, but he's far from happy with the comments from Parker and his handlers.
If the verbal bombs start flying at the press conference, Hearn expects the usually quiet Joshua to return fire.
"I was bantering with David Higgins yesterday. They truly believe they knock Anthony Joshua out. It's not even in question for them," Hearn told Sky Sports News.
"We feel otherwise. You're going to see a lot of fireworks this press conference. David Higgins has got a lot to say for himself, he's a funny character, and Anthony Joshua doesn't like what Joseph Parker has been saying. This could be the first time we've seen the switch of Anthony Joshua, and I'm excited to see it."
"AJ wants all the belts and Parker is the perfect fight, the perfect time. It's a great fight between two undefeated world heavyweight champions and we're close now."
The fight is being planned for March 31 at Principality Stadium in Cardiff, Wales.
Joshua fought at the venue back in October, when he retained the IBF, WBA, IBO world titles by stopping Carlos Takam in the tenth round.
Parker last fought in September, when he traveled to Manchester to retain his WBO world title with a twelve round unanimous decision over mandatory challenger Hughie Fury.