A second Russian athlete competing at the Winter Olympics has tested positive for a banned drug.

The Russian Bobsleigh Federation on Friday announced women's pilot Nadezhda Sergeeva had tested positive for a banned heart drug which the Olympic Athletes of Russia (OAR) confirmed was trimetazidince.

Her anti-doping rule violation follows that of Alexander Krushelnitsky, who on Thursday was stripped of the mixed doubles curling bronze medal he won with his wife, Anastasia Bryzgalova.

The Russian Bobsleigh Federation reported on its official Facebook page that Sergeeva tested positive on February 18, two days before the women's bobsleigh competition in PyeongChang, having returned a clean sample on February 13.

"The medical staff of the national team did not prescribe the drug to the sportswoman," the Russian Bobsleigh Federation said on Facebook.

"The Russian Bobsleigh Federation and the athlete herself understand the extent of her responsibility and understands how the event may react to the fate of the whole team."

Sergeeva and her brakewoman Anastasia Kocherzhova finished 12th in the women's two-person bobsleigh which took place on Tuesday and Wednesday.

An OAR statement said: "Today, the OAR delegation has received a formal notification that bobsledder Nadezhda Sergeeva, a member of the OAR team, was tested positive for a prohibited drug trimetazidine. The decision on this case will be taken according to the current rules. The OAR informed the IOC about doping offence immediately."

An earlier IOC statement read: "The OAR delegation has informed the IOC that they have received a notification from GAISF (Global Association of International Sports Federations) regarding an adverse analytical finding involving one of their athletes."

The latest anti-doping infraction could jeopardise Russian hopes of the suspension of the Russian Olympic Committee being lifted in time for Sunday's closing ceremony.

The ROC is under suspension by the International Olympic Committee following the systemic doping at the Sochi 2014 Olympics.