"Today our delegation received a notification from the International Olympic Committee [IOC] about possible violation of the anti-doping rules. We do not name the athlete and the sport art until the results of opening the B sample are known. They will be probably known in 24 hours," Vybornov said.
The International Olympic Committee has said in a statement it cannot comment on the separate cases of doping abuse as it is out of its competence.
On December 5, the IOC Executive Board decided to suspend the Russian Olympic Committee (ROC) over alleged "systematic manipulation" of the anti-doping system, but to allow selected "clean" Russian athletes to compete in the 2018 Olympics only under the Olympic Flag. As a result, 168 Russian athletes are competing in this year's Games.