Sergeeva - who finished 12th in the two-woman bobsleigh event in Pyeongchang - tested positive for an angina medication with performance-enhancing properties on February 18, the Russian bobsleigh federation announced on its Facebook page.
But referring to the two positive tests, he added: "There is no evidence of systemic doping and no evidence of the involvement of the Russian Olympic Committee in these cases".
International Olympic Committee president Thomas Bach said the failed tests were "very disappointing and prevented the International Olympic Committee from considering lifting the ban for the closing ceremony". It does not require any further decision by the IOC. In fact, the issue has been so prevalent that Russian Deputy Prime Minister Vitaly Mutko announced that there will be a Russian Olympics held for those banned from competing at PyeongChang.
"That is an automatic decision", he told reporters.
"We hope and count on the recovery of the Russian Olympic Committee (ROC) membership in the IOC within the next few days", the committee said in a statement.
"In light of the situation, we consider that the restoration of the rights of the ROC and all Russian athletes will be the main result of the Olympic Games that are ending today".
"This I don't know", he said, when asked about how long the Russians had to go without any more positive tests. And they're doing so in an arena filled with fans hoisting Russian flags. "I've heard athletes say that they were staying just because they wanted to walk with the flag and in our uniform".
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'I don't think these Olympic Games have been been tainted by the affair, ' he said. "It is hard for me to understand how any figure skater, hockey player or skier can win gold and stand on the podium without their flag".
Russians Alexander Krushelnitsky, a bronze medallist in mixed doubles curling, and bobsledder Nadezhda Sergeyeva were kicked out of the Pyeongchang Olympics after testing positive for banned substances.
The IOC vote means that Russian Federation will never be recorded as having taken part in the Pyeongchang Games.
On December 5, the IOC banned the entire Russian national team from taking part in the 2018 Winter Olympic Games, over allegations of mass doping violations.
Rodchenkov now lives in hiding in the United States.
The IOC "could have considered lifting the suspension given that the Olympic Athletes from Russia (OAR) had respected the IOC's decision of December 5", IOC president Thomas Bach said. "The acrimony caused by Bach's mismanagement should be his undoing", Walden said.
As has been protocol for the entire Olympics, instead of the Russian flag being displayed and Russian national anthem being played, the Olympic flag and Olympic anthem are in their stead.
But a compromise deal means that, while the Russian Olympic Committee won't have a formal presence at the Olympic Stadium here, they will have their suspension for state-sponsored doping lifted once the Games conclude.