Heavyweight Dillian Whyte believes unified champion Anthony Joshua is vulnerable if struck to the side of the head.

After reviewing several past fights, Whyte noticed that Joshua becomes unsteady or staggered when opponents land high on the side of his head.

Back in June of 2019, Joshua lost his IBF, WBA, WBO, IBO world titles when he was dropped four times and stopped in seven rounds by huge underdog Andy Ruiz.

"Listen Joshua's a great fighter and all that but he's vulnerable," Whyte told Matchroom Boxing.

"He's vulnerable to getting hit high on the right side of his head. It's the punch that he got hit with against Andy Ruiz. If you hit him on the side of his head, he goes over, I don't know if he's got an equilibrium problem or whatever."

Joshua was able to reclaim the belts when he dominated Ruiz over twelve rounds in their December rematch in Saudi Arabia.

Whyte felt Joshua underestimated Ruiz the first time around. Ruiz had taken the fight on late notice after his initial opponent, Jarrell Miller, was pulled from the fight due to failed drug tests.

"Also, he underestimated Ruiz, sometimes you get carried away," Whyte said.

"His team around him, some of the younger guys probably gassed him up. I don't know why he came into that looking like it was a walkover job. Ruiz did good but Joshua did exactly what he should have done, outboxed him, beat him up. Ruiz keeps asking for a third fight but there's no chance."

Whyte faced Joshua back in December of 2015, and was stopped in the seventh round. He staggered Joshua badly in the early rounds and wants to secure a rematch with the Olympic gold medal winner.

Whyte is slated to fight on July 4, against former world champion Alexander Povetkin.