The IAAF, track and field's world governing body, has appealed against the decision of the Turkish Athletics Federation to clear Cakir Alptekin, the Olympic women's 1,500 metres champion, of doping.
The TAF cleared Alptekin in December, saying it found no violations of doping rules by the 28-year-old, who won gold at the London 2012 Olympic Games, but the IAAF has now lodged an appeal with the Court of Arbitration for Sport in Lausanne.
Alptekin remains ineligible to compete until the CAS ruling.
Alptekin was provisionally suspended by the TAF last May after abnormalities were detected in her biological passport and she missed the IAAF World Championships in Moscow in August.
She was previously banned for two years in 2004 following a positive test at the World Junior Championships, and now faces a possible lifetime ban if a second offence is confirmed.
Meanwhile, CAS has dismissed the third case put before its ad hoc division in Sochi for incidents related to the 2014 winter Olympics.
Maria Belen Simari Birkner, an Argentinean skier, filed an application on February 11 against FASA, the Argentinean Ski Federation, and the Argentinean Olympic Committee for their failure to include her in the team to compete in the alpine skiing events of slalom, giant slalom and Super-G
CAS said the appeal was rejected less than 24 hours after the filing of the application as the court concluded it "did not have jurisdiction to entertain the application."
The ad-hoc court has already dismissed appeals from Daniela Bauer and Clyde Getty, freestyle skiers from Austria and Argentina, respectively, to be included in teams for Sochi.