Former world champion Tyson Fury discussed his drug test saga, which began in 2015 - when UKAD (UK-Anti-Doping) claimed the boxer tested positive for a high level of nandrolone in February of that year, in the aftermath of a win over Christian Hammer.

It was not only Tyson, but his cousin, heavyweight contender Hughie Fury, who also came up positive for the same substance.

The two boxers reportedly blamed their positive tests on eating uncastrated wild boar - but that piece of information was not mentioned in Tyson Fury's new autobiography, Behind The Mask.

When UKAD went after Fury, an extended legal battle played out.

In the end, both sides reached an agreement in 2017 where Fury accepted a back-dated two year ban. He resumed his career in June of 2018, after being inactive since a career-defining win over Wladimir Klitschko in November 2015.

"From February 2015 to December 2017 a cloud of suspicion hung over me relating to an accusation that a high level of nandrolone had been found in my system and that of my cousin, Hughie Fury," Fury wrote in the book, according to The Mirror.

"I had to resolve this before I could truly believe I could fight again. I had been tested regularly by the drugs people at UKAD, probably more than most boxers, and when the case with them finally came to a conclusion they were able to list a series of tests that came back negative.

"The issue of the raised level of nandrolone came in a test in February 2016, but I wasn’t made aware of possible charges against me until long after that. The body naturally produces nandrolone but mine had a high level for some reason. I can categorically state, however, that I have never taken any performance-enhancing drugs and never will.

"The big question that did remain after the case was resolved was why it had taken UKAD so long to sort it out. Why did they leave me in limbo, allowing people to call me a drugs cheat, allowing me to be humiliated like that?

"But God was on my side and when God is on your side, who should you be afraid of? Nobody! When the case did come to a conclusion, the statement by UKAD made it clear that they could not establish why I had that raised level of nandrolone. The case cost over £1 million in lawyers’ fees and it was discussed in the press that if I had won the case – which I know I would have – then it could have left UKAD bankrupt.

"But that could easily have meant another three or four years battling in court. Anyway, the case was finally cleared up and I could seriously start thinking about fighting again."