Mo Farah has responded to the Fancy Bears hack in which personal information was leaked.
He has emphasised that he has "never failed a blood test", defending himself against information which appears to show his test results once caused suspicion.
The hacking group Fancy Bears published documents on Wednesday, 5 July, which claim Farah returned a sample which needed further testing.
The data goes on to show Farah was then cleared when his results were later viewed as "normal".
A spokesperson, speaking on behalf of the four-time Olympic gold champion, said: "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 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.”