Former WBO world champion Joseph Parker would back his good friend, Tyson Fury, to score a knockout of Anthony Joshua or Oleksandr Usyk.

Fury, who holds the WBC heavyweight title, has claimed that he plans to retire from the sport - but he also leaves the door open to fight the winner of the August rematch between Usyk and Joshua, who battle for the IBF, IBO, WBA, WBO heavyweight titles.

Parker and Fury are often in training camp together.

He believes Fury would be too much for Joshua and Usyk.

"Those are both great fighters, Joshua and Usyk, I just see Tyson being too much for them. Everyone's going to say I'm biased because I train with Tyson and we're very close. If I step back as a friend and think boxing, he's too much, able to put on the pressure, able to fight on the back foot, very good mover. If he does get the opportunity to fight either of those guys, I think he'd knock them out," Parker told Sky Sports.

"It's going to take big money to get him back into boxing and into the ring and for battle. I don't think he should retire. I think he should fight the winner out of [Anthony] Joshua and [Oleksandr] Usyk and whoever wins that is the best in the world at this time and so he should come back and fight the winner."

As far as Parker goes, the New Zealand star would love a rematch with Dillian Whyte, who back in April was knocked out by Fury.

"Dillian Whyte is another great fight, he's coming off a loss to Tyson Fury but we had a very great fight in 2018, a very entertaining fight and a very close fight. If we do run it back, I'll get the better of him," Parker said.