Outgoing World Anti-Doping Agency president John Fahey confirmed "there is a matter that is being considered" about Russia's accredited anti-doping testing lab, three months after WADA revoked accreditation for Rio de Janeiro.
He gave no time-frame for the probe, but would comment "when the process is properly concluded", Fahey told media at a global anti-doping conference in Johannesburg yesterday.
Up to now cancelling accreditation has been one of the few tools WADA has had to police the anti-doping fight.
The revised code will come into effect in 2015.
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"The accreditation of laboratories is related to quality," said Fahey, adding that "the standard for quality is extraordinarily high -- as it should be."
Global sport leaders discussed lab standards on Thursday, the third and penultimate day of the conference to decide the future of the battle against illegal performance-enhancers.
If Moscow loses its accreditation, it cannot test athletes' urine and blood samples for banned substances in the Winter Olympics in Sochi from February 7 to 23.
The IOC would then have to fly samples to another country for testing -- potentially a costly matter.
Earlier this week global football body FIFA said it would fly around 800 footballers' samples from Brazil for testing in Switzerland during the World Cup from June 12 to July 13.