Russia has no track and field athlete left at the Rio de Janeiro Olympics after its only eligible one, long jumper Darya Klishina, has been told by the ruling body IAAF she cannot compete.
An IAAF spokesman told dpa on Saturday it "has withdrawn the special eligibility based on new information received last week," a decision that applies not only for the Olympics but all other competition.
The spokesman gave no further details on the new information.
But Russian state news agency Tass quoted an unnamed Russian sports official as saying the IAAF requested additional information on Klishina after a report drawn up by Canadian investigator Richard McLaren for the World Anti-Doping Agency (WADA) revealed wide-spread and state-sponsored doping in Russia.
The report was released on July 24. Russia escaped a blanket ban despite the grave allegations, but its athletes had to meet strict criteria to compete in Brazil, with some 280 of them now at the Games.
Klishina swiftly appealed the IAAF decision at the Court of Arbitration for Sport (CAS), which said in a statement that it plans to rule before midnight Rio time on Sunday (0300 GMT Monday).
Long jump qualifying is Tuesday and the final the following day.
The CAS said Klishina is contesting "the decision declaring her ineligible to compete in international competitions, including the athletics competition at the Olympic Games 2016," which was taken by the IAAF's doping review board on August 12.
United States-based Klishina had been the only Russian track and field athlete allowed to compete in Rio, after the Russian athletics federation was suspended over doping practices in the country and its other 67 proposed Olympic athletes were banned - a ruling that was confirmed by CAS last month.
The two-time European indoor champion Klishina was given the nod because she had undergone enough independent doping tests outside Russia.
She was considered a traitor in some Russian social media cycles.
Russian Olympic Committee (ROC) president Alexander Zhukov was not amused at all with the latest ruling.
"The situation with Darya Klishina looks like a cynical mockery of the athlete by the IAAF," the ROC Twitter account quoted Zhukov as saying.
The International Olympic Committee (IOC) took notice of the developments.
"We understand that the IAAF has declared Darya Klishina ineligible to compete in Rio and that the athlete has appealed the decision in front of CAS," it said in a brief statement e-mailed to dpa, referring any further queries to the IAAF.
Another Russian athlete, 800-metre runner Yulia Stepanova, was also allowed to compete by the IAAF, in recognition of the fact that her information had been vital to help uncover the doping scheme in Russia, made public via two reports of a commission led by former WADA chief Dick Pound.
But the IOC then barred Stepanova from the Games.
WADA said Saturday that her account in the agency's anti-doping administration and management system had been hacked in a recent cyber attack.