In a statement, the CAS anti-doping division confirmed Sergeeva, competing for the Olympic Athletes from Russia (OAR), had admitted a doping offence.

Sergeeva finished 12th in the two-woman bobsleigh event where she had been the pilot with partner Anastasia Kocherzhova.

Their result has been annulled and Sergeeva, the second OAR athlete to test positive at Pyeongchang 2018, has been stripped of her accreditation.

The 30-year-old has also agreed to a provisional suspension but reserved her right to seek the "elimination or reduction of the ineligibility period" following the conclusion of the Games.

An Vannieuwenhuyse and Sophie Vercruyssen of Belgium are set to be moved up to 12th place following the confirmation from CAS.

It came at the same time as the start of a meeting of the International Olympic Committee (IOC) Executive Board, who are determining whether to lift Russia's suspension in time for tomorrow's Closing Ceremony.

It is thought Russia's chances of having their suspension lifted have been drastically reduced by the second doping case.

Sergeeva tested positive for trimetazidine, a stimulant usually used to treat patients suffering from angina.

The drug is believed to have similar effects to meldonium, the substance fellow OAR athlete Aleksandr Krushelnitckii tested positive for.

Krushelnitckii was stripped of the Olympic mixed doubles curling bronze medal he won with wife Anastasia Bryzgalova by the CAS anti-doping division on Thursday (February 22).

Before news of Sergeeva's drugs test emerged, there had been widespread optimism from Russian officials here that they would be allowed to take part in the Closing Ceremony, despite the positive case involving Krushelnitckii.

A spokesperson for the Russian Bobsleigh and Skeleton Federation told Sport Express that Sargeeva submitted a sample with a low level of the drug on Sunday (February 18).

She had reportedly submitted a negative test five days earlier.

Sergeeva was among several Russians who tested positive for meldonium in 2016 but was cleared after the World Anti-Doping Agency (WADA) adopted an amnesty for athletes who had a low dose of the then newly-added substance to its banned list in their samples.

Trimetazidine is the same drug that China's three-time Olympic swimming champion Sun Yang failed for in 2014 and for which he served a secret three-month ban.

WADA added the drug to its banned list in 2014 for in-competition testing.

The following year they re-classified it as a metabolic modulator, making it banned in and out-of-competition.

Scientists claim trimetazidine improves athletes' ability to transport oxygen around their bodies.

Trimetazidine was among the banned substances identified in the McLaren Report as being used by Russian athletes before Sochi 2014 but not being properly reported as positive by Moscow Laboratory director Grigory Rodchenkov.

Richard McLaren, the Canadian lawyer who carried out the report, found at least eight cases that had been covered up by Rodchenkov. 

Sageeva was not implicated in the "systematic manipulation" of the anti-doping system at Sochi 2014, where she finished 18th.

She was among 169 Russian athletes cleared to compete as neutrals at Pyeongchang 2018 by the IOC.