The American coach of Olympic champion Sir Mo Farah may have broken anti-doping rules to boost the performance of some of his athletes, says a leaked report.
Alberto Salazar has been under investigation since a BBC Panorama programme made allegations about drugs use at his US training base.
A leaked US Anti-Doping Agency (Usada) report, dated March 2016, has been obtained by the Sunday Times.
Salazar and Briton Farah deny they have ever broken anti-doping rules.
The leaked report also alleges Salazar, head coach of the world famous endurance Nike Oregon Project (NOP), routinely gave Farah and other athletes legal prescription drugs with potentially harmful side-effects without a justifiable medical reason.
The investigation into Salazar, who is also a consultant to UK Athletics (UKA), has been under way since at least June 2015.
The Usada interim report was passed to the Sunday Times by the suspected Russian hacking group Fancy Bears.
The BBC has so far been unable to verify its authenticity with Usada, or establish whether any of its reported conclusions are out of date.
In a statement, Usada said it could “confirm that it has prepared a report in response to a subpoena from a state medical licensing body regarding care given by a physician to athletes associated with the Nike Oregon Project”.
It said: “We understand that the licensing body is still deciding its case and as we continue to investigate whether anti-doping rules were broken, no further comment will be made at this time.
“Importantly, all athletes, coaches and others under the jurisdiction of the World Anti-Doping Code are innocent and presumed to have complied with the rules unless and until the established anti-doping process declares otherwise. It is unfair and reckless to state, infer or imply differently.”
Contents of the report
According to the Sunday Times, the leaked report claims that Salazar:
used a banned method of infusing a legal supplement called L-carnitine;
risked the health of his athletes, including Farah, by issuing potentially harmful prescription medicines to improve testosterone levels and boost recovery, despite no obvious medical need.
Salazar maintains that drug use has always fully complied with the Wada code and that athletes were administered with L-carnitine in “exactly the way Usada directed”.
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