Johnathon Banks, who trained former unified heavyweight champion Wladimir Klitschko for the final few years of his career, believes Anthony Joshua will not have success if he applies his recent fighting style in a battle with Tyson Fury.
Joshua, who holds the IBF, IBO, WBA, WBO heavyweight titles, was stopped by Andy Ruiz in seven rounds in June 2019. In his next two fights, he fought in more of a cautious boxing style - instead of his usually aggressive, power-punching style.
He got revenge with a twelve round decision over Ruiz in their December 2019 rematch and then stopped mandatory challenger Kubrat Pulev in nine rounds a year later.
Joshua's handlers are currently in serious negotiations to finalize a two-fight unification series with Fury, who holds the WBC world title.
If a deal is reached, the contest will likely land in May or early June.
"The fight is huge. I don't care where you put it but especially if you put it in the UK, that's huge. Fury is the only one that's undefeated, so you have to give the edge to the undefeated guy, I'm assuming," Banks told The Sun.
"But it all depends on how AJ wants to fight. He can't fight Fury like he fought Andy Ruiz in the second fight. And he definitely can't fight Fury how he just fought Pulev the last fight. He has to figure out another way of fighting Fury. If AJ was to be real physical, that would be, to me, one of the best ways to fight him."
In the last two fights of Klitschko's career, he lost to Fury and Joshua.
Fury outboxed Klitschko over twelve rounds in 2015, and then two years later Joshua was forced to get off the floor to stop Klitschko in the eleventh round.
"On the one hand I knew we had issues in the ring before Fury and I knew we'd have issues in the fight. And on the other hand in the AJ fight, I knew Wlad could win but I just wanted him to go for the knockout when I told him to. But he didn't get him at that particular time so that was a little bit frustrating but things happen sometimes in boxing that out of your control," Banks said.