Buddy McGirt, the new head trainer of heavyweight veteran Derek Chisora, is backing his fighter to break the will of former WBO world champion Joseph Parker.

The boxers will collide on May 1, with DAZN and Sky Sports Box Office carrying the event.

Parker has picked up four wins since his decision loss to Dillian Whyte in 2018 - in a fight where Parker was an inch away from stopping Whyte in the twelfth and final round.

Both Chisora and Parker retained new trainers since their last ring outings.

Earlier this year, Parker struggled in his decision win over domestic rival Junior Fa. He parted ways with longtime coach Kevin Barry and hired former world champion Andy Lee, who works with several boxers including WBC world champion Tyson Fury.

Chisora lost a competitive decision to Oleksandr Usyk last fall. He recently hired veteran trainer McGrirt, who is also a former world champion.

"I mean it's not going to be an easy task, but we've just got to keep the heat on him," McGirt told Sky Sports. "It's not a secret. Keep the pressure and the heat on, and make him uncomfortable, every second of every round.

"If you try to stay on the outside with Parker, he'll eat your lunch box. He'll tear you up. But if you put that heat on him and make it hot in the kitchen, it's a different ball game. I can tell you, he's got the right nickname, 'War'. He's very unique, he just wants to rumble. The key is to get him to rumble in a smarter way, that can just make it better for him.

"I don't see him as a challenge [to train]. I think it's communication. You can tell somebody something, but if you tell them and show them, that's the difference. If you can't show the guy, his confidence isn't going to be the best in you."