Tyson Fury believes former world champion Anthony Joshua is “finished” after his shock defeat by Andy Ruiz Jr.
Joshua, 29, gave up his IBF, WBA and WBO titles in a seventh-round stoppage loss to Ruiz in New York on June 1.
Speaking before Saturday’s bout with Tom Schwarz – which will be broadcast by BBC Radio 5 Live – Fury said Joshua did not want to be in the ring.
“When a man doesn’t want to be there once, he will always do it and it’s hard to come back from,” said Fury.
“It’s been done many different times by many different fighters. He did it that night and I don’t think he will come back from it. Finished. Ask any top trainer who has been around the sport a lifetime. When he got to the ring I saw he didn’t want to be there.”
Fury’s Las Vegas contest with Schwarz will air on 5 Live in the early hours of Sunday morning in the UK.
The bout comes two weeks after Ruiz ripped up the heavyweight division’s plot lines by inflicting a first career defeat on Joshua, who had previously made Fury an offer to fight.
“Everybody thought that man could beat me,” Fury added. “In what world could he ever beat me? What were people seeing? I don’t know what people were looking at as I don’t know in what world he could have beaten me.”
Fury this week said he respects Joshua and regards him as “a winner in life” for how he has achieved sporting success after brushes with the law in his youth.
But Joshua’s loss has halted talk of any immediate fight with Fury or WBC champion Deontay Wilder as the 2012 Olympic champion is now intent on fulfilling a rematch with Ruiz.
Fury, who battled mental health and drug issues before returning to the sport after a 31-month spell of inactivity in June of 2018, believes Joshua will lose the repeat fixture.
In referencing Ruiz’s much publicised fleshy physique and his own win over Wladimir Klitschko in 2015, Fury told 5 Live Boxing’s Mike Costello and Steve Bunce that such results prove “body types mean nothing in boxing.”
“Physically Joshua could out-train everyone,” added Fury, 30. “He would break every heart monitor, has probably worn out every treadmill in the gym, smashes the bag, it’s all very unimportant.
“Boxing isn’t rocket science and today people are trying to make it a scientist thing. If you can fight you can fight if you can’t you can forget about it. You can eat every protein bar in the world, when you get banged on the chin and panic, it don’t really help you much.
“People who don’t understand boxing look at a fat man and think he can’t fight. The best feeling I got from it was the two best conditioned fighters in the last 20 years have been Klitschko and Joshua and they both got done by two fat men.”