The Olympic silver medallist and former professional world champion tested positive for ostarine following his fight with compatriot Kell Brook at Manchester Arena on February 19, 2022.

Thirty-six-year-old Khan lost the fight via a sixth round TKO and retired in May.

Ostarine is known for boosting muscle and causing a loss of fat at the same time.

Khan did successfully argue that he did not take the substance intentionally, with documents saying that he intended to rely on expert evidence that the concentration found in his samples was "inconsistent" with any intention to break the rules.

Witness Professor Pascal Kintz Said the dose "did not correlate with an intention to use ostarine for performance enhancement".

However, Khan was unable to say where the ostarine had came from and there was a lack of a "reliable record" on the supplements he had used.

Khan was notified of his failure by UKAD on April 6 of last year, which handed him a provisional suspension.

He was then charged in July but Khan's claim he ingested the substance non-intentionally meant an independent tribunal needed to hear the case.

"The tribunal accepts the evidence of Amir Khan was truthful but his recollection on certain matters was unclear," findings say.

Khan's ban will expire on April 5, 2024 after being backdated to the start of his provisional suspension.

"This case serves as a reminder that UKAD will diligently pursue anti-doping rule violations in order to protect clean sport," said UKAD chief executive Jane Rumble.

"Strict liability means athletes are ultimately responsible for what they ingest and for the presence of any prohibited substances in a sample. 

"It is important that all athletes and their support personnel, whatever level they are competing at, take their anti-doping responsibilities seriously. 

"Not doing so risks damaging not only an athlete's career, but also undermining public confidence in clean sport."

Khan became a household name in Britain when he won Olympic silver in the lightweight class at Athens 2004 aged just 17, losing only to Cuban great Mario Kindelán.

He went on to enjoy a fine professional career which currently stands at 34 wins and six defeats.

In 2009 he defeated Ukraine's Andreas Kotelnik to win the World Boxing Association's light welterweight title, which he unified with the International Boxing Federation belt when he knocked out American Zab Judah in 2011.

Outside of sport, Khan has appeared on reality television and become a celebrity away from the ring.

He this morning appeared on British news programme Good Morning Britain, to speak about an incident last year when two men robbed him of a £70,000 ($87,000/€80,000) watch at gunpoint.

"I've never cheated in my life," he said to Sky Sports News following the issuing of his ban. 

"I'm the one that wanted testing on that fight. 

"Also, the amount that was in my system could have been by shaking people's hands. 

"I don't know the drug that was in my system. Ostarine?

"I would never cheat, I'm a retired fighter. 

"I've got a two-year ban now which is quite strange and funny that they banned me. 

"I've already retired, I've no comeback plans at all."