Anthony Joshua admitted his rematch with Oleksandr Usyk is "must win" ahead of the fight on Saturday.

Joshua was surprisingly outclassed by Usyk at Tottenham Hotspur Stadium last September as the Ukrainian won the IBF, WBA and WBO world heavyweight titles.

Usyk will defend his belts for the first time in a rematch this weekend with the Briton in Saudi Arabia.

Speaking at the final press conference before their bout at the Shangri-La hotel in Jeddah, Joshua insisted he has to win, but felt confident after his camp with new trainers Robert Garcia and Angel Fernandez.

"That's it. Must win," Joshua said. "I like the pressure. It's been tough. Robert Garcia, Angel Fernandez, existing members of my previous team as well, definitely pushed me, challenged me. 

"Now we just get the job done. Instinct, stay focused, get the job done, God willing, victorious."

On his motivation for the fight, where he will face the unfamiliar role of challenger, Joshua said: "It's competition.

"I've got goals I want to achieve in the ring on the night. That's competition with myself. You've got to have a competitive spirit."

Usyk is aiming to repeat his impressive performance from the first fight, and seemed relaxed at the press conference, echoing what his opponent said about the importance of competition.

"We were born to compete for life, for belts, for everything. The one who does not compete does not live," Usyk said.

"All our lives are competition, for anything, for something, for somebody. That's why we are competing."

Either as a mind trick or simply to show how unfazed he was in general, as Joshua was leaving the stage following their face off, Usyk burst into song, joined by members of his team.