Anthony Joshua believes Joseph Parker will face an “overwhelming” experience in a unification bout which will go down in “history” on Saturday.
WBA and IBF world heavyweight champion "AJ" will face off against WBO king Parker at Principality Stadium in Cardiff, Wales.
It will be the Briton's fourth stadium bout, with 80,000 fans expected on the night.
However, Joshua believes the bout will present a challenge for his New Zealand opponent.
Speaking to BBC Radio 5 live, he said:
”It took me a few times to get used to it. It’s an experience he hasn’t faced yet. It is daunting, it is overwhelming.
”You have a fighter that will block out the noise, which takes a whole heap of energy. Then you have a fighter who rides the wave, which can leave you too excited.
”The fight is won or lost in training camp but the last bolt is screwed on during the spell from your changing room to the first bell.”
Joshua then explained to BBC Sport that he has been watching videos of Lennox Lewis, who held the IBF, WBA and WBC titles in 2000.
Since Lewis' retirement, only Tyson Fury and Wladimir Klitschko have held three heavyweight titles at one time.
And as well as three of the four heavyweight titles, Joshua and Parker will put undefeated records on the line in the Welsh capital.
”This is history. This is a unification fight with two heavyweights undefeated and it’s in the UK.
”It’s going to be electric. You know when you come here to fight myself, you know there’s going to be blood, a fighter hurt and 20 times out of 20 I’ve been victorious, so expect the same routine.”