A spokesperson for Mo Farah has said any suggestion of misconduct from the four-time Olympic champion "is entirely false and seriously misleading", after the release of a hacked document that claims his biological passport once flagged up unusual results before he was later cleared.
The 'Fancy Bears' hacking group, who leaked data from the World Anti-Doping Agency last year, published a fresh series of documents on Wednesday apparently taken from an IAAF database - three months on from world athletics' governing body confirming it had been the victim of a cyber-attack.
One of the documents shared in the latest leak suggests Farah's biological passport was viewed by an expert as "suspicious" in November 2015. A subsequent document from April 2016, following further testing, then appears to clear Farah of any suspicion, with his results viewed as "normal".
A spokesperson for Farah was quoted by the BBC as saying: "We have never been informed of any of Mo's test results being outside of the legal parameters. Nor has Mo ever been contacted by the IAAF about any individual result.
"It is totally incorrect and defamatory to suggest otherwise, and we will pursue any claims to the contrary through all necessary legal routes.
"It has been widely reported that previous leaks from this organisation [Fancy Bears] have included false or altered documents, and we have asked the IAAF to urgently look into the validity.
"Regardless, any suggestion of misconduct is entirely false and seriously misleading. Mo Farah has been subject to many blood tests during his career and has never failed a single one."