• Farah says anybody can test or retest him ‘now or at any time in the future’ • Reports say Usada wants British athlete tested for banned blood-booster

Mo Farah insists that he is more than happy for his blood samples to be retested after claims that the United States Anti-Doping Agency wants them checked for the banned blood-boosting drug EPO.

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According to a report in Saturday’s Daily Mail, Usada believes it has enough evidence to warrant a new analysis of all samples from Alberto Salazar’s training group, the Nike Oregon Project, where Farah has trained since late 2010, and it has asked the UK Anti-Doping agency to release Farah’s drug test samples for testing. However, Ukad are holding fire while they wait to see and assess Usada’s evidence.

Farah, who has continued to vehemently deny any wrongdoing, insists he has nothing to hide. “I’m not aware of any request,” he said. “But as I’ve said many times, I’m happy to be tested any time, anywhere and have any of my samples tested or retested now or at any time in the future, by any official body.”

British Athletics, which is known to be frustrated by the constant leaks and drip feed of allegations against its top athlete, did not comment on the latest news. However, on Thursday its performance director, Neil Black, said he was confident the organisation had done everything by the book and would stand by Salazar unless serious wrongdoing was confirmed by Usada. “Everything we do, and the way we act, follows really, really correctly the processes of clean athletics,” he added. “If it says: ‘You do x, y and z,’ then we do x, y, and z.”

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The Ukad chief executive, Nicole Sapstead, has said she will not be rushed into re-examining Farah’s samples despite what she called an excellent working relationship with Usad – because it jeopardises Ukad’s ability to re-test the samples in the future as it only holds a limited amount of Farah’s blood.

“Each time a sample is reanalysed or sent to another location, the amount contained within a sample can be reduced or has the potential to degrade which limits the possibility to test again in the future,” Sapstead said. “Decisions as to testing and analysis therefore require careful consideration, and national anti-doping organisations can quite legitimately disagree in this regard.”

Ukad said it would not comment specifically on the allegations against Farah but said that “status is no barrier to thorough testing or potential investigations”.

Sapstead also criticised the recent links of the Usada report and other information about Farah. “This only serves to fuel rumour and innuendo and has the potential to undermine the principle of confidentiality which is crucial to robust and thorough anti-doping investigations,” she said.

“If any individual or organisation possesses any pertinent information related to anti-doping allegations they are encouraged to make that known to UK Anti-Doping.”

Salazar has been the subject of a Usada investigation since being accused in a BBC Panorama documentary of a series of doping violations in June 2015. The same month he issued a forceful 12,000-word riposte denying all charges and has continued to maintained his innocence.