SIR Mo Farah says he is happy to be drug tested “any time, anywhere” and has no issues with his historical samples being reanalysed.

The four-time Olympic champion is back in the spotlight after fresh doping allegations against his coach, Alberto Salazar.

In the latest development, it was reported on Saturday that American anti-doping investigators believe they have enough evidence to retest the samples of athletes at the Nike Oregon Project, run by Salazar.

The report said Farah’s sample would be among those analysed, although it would be for UK Anti-Doping (Ukad) and not the US authorities to decide whether there was cause to look again at any tests taken by British athletes.

Farah has repeatedly denied any wrongdoing and says he is happy to comply with the wishes of any anti-doping authority. He said: “I’m not aware of any request 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.”

Farah has remained loyal to Salazar, who has denied all accusations of wrongdoing since doping allegations against him were first broadcast by BBC’s Panorama programme in June 2015.

Lord Coe, president of athletics’ world governing body the IAAF, said judgement should be reserved until the United States Anti-Doping Agency announces its findings.

Coe said: “We’re still awaiting the final report from the United States Anti-doping Agency. I don’t think you can assume very much more until you have seen that report.

“The relationship between a coach and athlete is as close as a marriage, it can only be based on trust.

“We had this discussion some time ago and it was very clear that Mo was going to ask tough questions. You have to assume that, if he’s still comforted and trustful about Alberto Salazar, then he’s had the answers to the questions he’s posed.”

Coe revealed Russia could be allowed back into the global athletics fold later this year. A ban was imposed in 2015 following evidence of state-sponsored doping.

Coe said: “I hope there is a real possibility of that. We should acknowledge the progress that is being made.

“The task force is very clear that there are still some challenges that lie ahead but there’s no doubt that the new Russian federation has grasped the scale of the problem.”