Anthony Joshua believes Tyson Fury’s failed drug test has haunted his rival’s two world title triumphs.
Fury was hit with a backdated two-year ban in 2017 having tested positive for the banned steroid nandrolone in early 2015.
Later that same year he outpointed Wladmir Klitschko to become heavyweight world champion for the first time.
Fury blamed the positive test on eating uncastrated wild boar and accepted the ban which allowed him to return to the ring in 2018.
He went on to beat Deontay Wilder earlier this year to become a two-time champion – but his brush with UK Anti-Doping then resurfaced when a farmer claimed he had been bribed into saying he had provided Fury with the wild boar.
Martin Carefoot said he had been offered £25,000 to lie but was never paid and later withdrew his allegation.
Fury and his team have consistently denied they offered to bribe the farmer although UKAD are still conducting an investigation.
And when asked about his rival’s past, Joshua said: “With the UKAD situation, every win he’s had has had drama around it. Whether it was to do with Klitschko, Wilder, there is always drama.
“I’m a straight-up warrior, I just want to fight him. I don’t care about anything in his body.
“He knows about my uppercut, he knew about it from when I was 20 years old.
“Trust me, he knows what’s coming.”
Fury and Joshua are set to clash next summer after agreeing in principle to meet twice in 2021.
Terms are being thrashed out with an agreement expected early next year.
And Joshua added: “I’m serious about the fight so when I announce it, you’ll know it’s real.”