Unknown heavyweight boxer Joey Dawejko 'dropped' Anthony Joshua during a sparring session in 2019, according to coach Justin Fortune.

Fortune, who is Manny Pacquiao's strength and conditioning coach, believes Tyson Fury will defeat Joshua if they face off in their highly anticipated heavyweight unification bout later this year.

He named Fury's experience and his chin as reasons why he believes the Gypsy King will prevail, before claiming that Joshua was knocked down by Dawejko in sparring.

Speaking to Elie Seckbach, Fortune said: "Joshua is tall. Fury is taller, and he is much more experienced. Fury is an octopus, and he will talk s*** in your ear for twelve rounds.

Anthony Joshua sparred Joey Dawejko and the unknown American heavyweight "dropped him", according to Manny Pacquiao's coach Justin Fortune

"And Fury's got a better chin than Joshua. He got up from Deontay Wilder’s devastating right hand. Dawejko dropped Joshua."

The alleged knockdown came during Joshua's preparation for his shock loss to Andy Ruiz Jr and, according to talkSPORT, it may have left AJ with a concussion.

However, his promoter Eddie Hearn denied the rumours at the time, telling IFL TV : "A journalist messaged me the next day, 'We heard he got knocked out by Agit Kabayel'.

Andy Ruiz shocked Anthony Joshua last summer
The alleged knockdown came before Joshua's shock defeat to Andy Ruiz Jr in 2019

"I said 'Agit Kabayel wasn't in the camp'. They said, 'Who else did he spar with?' I said 'Ke sparred with Joey Dawejko'. [They said] 'Oh, Joey Dawejko knocked him out'.

“I’m not in camp. I speak to AJ, I speak to Rob [McCracken], I speak to all the people. No [he wasn’t knocked out], not at all. They had two spars.

"Not at all. How many times has AJ had a fight where the rumours are that he's been dropped in camp?

"Every fight. And actually the only one that when you speak to AJ he talks about is David Price dropped him in sparring.

"And actually he’s not the kind of guy who would sort of deny or hide from it."

READ MORE: Deontay Wilder's sacked coach says Bronze Bomber's career is 'finished' in brutal rant

READ MORE: Jake Paul takes fresh swipe at Conor McGregor after calling out Floyd Mayweather again