Mo Farah missed two drugs tests in the run-up to the 2012 Olympic Games, according to a report in the Daily Mail on Thursday.
Farah, who won 5,000 and 10,000 metres gold in London, has had a difficult time of late with his coach, Alberto Salazar, the centre of recent doping allegations.
Farah, 32, dropped out the Diamond League meeting in Birmingham earlier this month as a result of the claims which centred on Farah's American training partner, Galen Rupp.
But while Salazar and Rupp deny the claims and Farah has not been accused of anything illegal, the Daily Mail claims he put his participation at the 2012 Games in jeopardy by missing two tests, one of them after he started training under Salazar in February 2011.
A pool of nationally-registered athletes are required to adhere to the whereabouts rule, specifying where they will be for an hour a day, seven days a week, for up to three months in advance. UK Anti-Doping (UKAD) rules state an athlete who misses three tests in any 12-month period - reduced from 18 months since 2013 - can face a ban of up to four years.
According to the Mail, Farah's first missed test appears to have occurred in early 2010, several months before he started working with Salazar.
It was also six months before he broke David Moorcroft's 28-year-old British 5,000m record and became the first Briton to complete the distance in under 13-minutes. But the second missed test is claimed to have been scheduled once Farah had started working with Salazar.
The report says it should have taken place at Farah's home in Teddington, London, but the athlete appealed to UKAD, claiming that he did not hear his doorbell.
The Mail cited correspondence it said it had seen between lawyers and claimed Farah and Salazar made clear the Somali-born athlete's concerns about a suspension. It alleged that Salazar had warned Farah on May 11 of that year: "If you miss another test, they will hang you."
Salazar, under whose guidance Farah has won five global titles over 5,000m and 10,000m, is head coach at the prestigious Nike Oregon Project in Portland and an "unpaid consultant" for UK Athletics, which has launched a review into the American's relationship with the governing body and Farah.
Farah, who will return to Diamond League action in Monaco, has said he intends to stand by his coach unless he is proven to have done wrong.
UKAD refused to comment on allegations of the missed drugs tests. A statement read: "UK Anti-Doping does not disclose personal data relating to an individual's test history. UKAD has a dedicated Athlete Support Officer who works with athletes on the National Registered Testing Pool, and with National Governing Bodies of sport, to ensure they manage their whereabouts reporting responsibilities."