(Adds Salazar, Nike statements)
Feb 26 (Reuters) - Alberto Salazar, the coach of Britain's Olympic champion Mo Farah, has denied administering banned supplements to his athletes and issued a firm rebuttal of what he said were false allegations against him in a British newspaper.
The Sunday Times earlier reported that Salazar had used prohibited infusions of supplements to improve the performance of his runners, citing what the newspaper said was a leaked United States Anti-Doping Agency (USADA) report.
But the coach, who was accused of violating anti-doping rules in a BBC documentary in 2015, said on Sunday that the newspaper had "recycled old allegations" he had already refuted.
The Sunday Times was not immediately available to comment.
"I have clearly and repeatedly refuted allegations directed against me and the Oregon Project," Salazar said in a statement referring to Nike's training centre for elite distance runners.
"I believe in a clean sport and a methodical, dedicated, approach to training. The Oregon Project will never permit doping and all Oregon Project athletes are required to comply with the WADA (World Anti-Doping Agency) Code and IAAF (International Association of Athletics federations) Rules.
"I do not use supplements that are banned."
The Sunday Times said Farah and other athletes coached by Salazar were given infusions of a research supplement based on the chemical L-Carnitine and that one athlete who was given a high dosage said it was as effective as illegal blood doping.
Responding to the newspaper report, Farah said in a statement that he was "a clean athlete who has never broken the rules in regards to substances, methods or dosages".
Salazar, a Cuban-born American marathon runner who has worked with Farah since 2011, said his athletes had used L-Carnitine but added in his statement that it was not a banned substance and had only been administered after he had checked in writing with USADA about what its guidelines were.
"L-Carnitine is a legal nutritional supplement that is not banned by WADA," he said. "Any use of L-Carnitine was done so within WADA guidelines.
"I also communicated in writing with USADA in advance of the use and administration of L-Carnitine with Oregon Project athletes... who were then administered L-Carnitine in exactly the same way USADA directed."
Salazar added: "The leaking of information and the litigation of false allegations in the press, is disturbing, desperate and a denial of due process.
"I look forward to this unfair and protracted process reaching the conclusion I know to be true."