A summary of sports events and persons who made news on Thursday.
Denis Oswald, the International Olympic Committee's permanent chair of the disciplinary commission, said Valieva claimed there was a mix-up at a Court of Arbitration for Sport (CAS) hearing into whether she should be allowed to continue competing.
Alberto Contador is free to compete again after Spain's cycling federation (RFEC) lifted his one-year doping ban on Tuesday but the Tour de France champion still faces the threat of possible appeals by two global bodies.
Tennis aces Mahesh Bhupathi and Sania Mirza have urged the Indian cricketers to shrug off all apprehension about the vexed 'whereabouts' clause in the World Anti-Doping Agency (WADA) code and sign on the dotted line.
Sprinter Dwain Chambers and cyclist David Millar were cleared to compete in this year's London Olympics after the British Olympic Association's (BOA) lifetime Games ban on drug offenders was overturned by the Court of Arbitration for Sport on Monday.
Jamaica's twice Olympic 200 metres champion Veronica Campbell-Brown was suspended by her national federation on Tuesday following a positive test for a banned diuretic at a meeting last month.
West Indies all-rounder Andre Russell was banned on Tuesday for one year for a doping whereabouts rule violation.
NADA Director General Rahul Bhatnagar said that the WADA had filed an appeal against the reduced penalty and the matter would come up before the NADA Appellate panel on February 15.
Long jumper Murali Sreeshankar on Sunday 'voluntarily' gave dope sample to the NADA officials after producing a big leap of 8.41m to qualify for the upcoming World Championships so that 'nobody points any finger of suspicion'.
Lance Armstrong may be ready to admit to doping and say sorry for his actions but his old nemesis, former-World Anti-doping Agency (WADA) chief Dick Pound, does not expect any apologies coming his way.
The Board of Control for Cricket in India on Monday rejected the contention of the World Anti-Doping Agency in Pakistan that it has violated of the global body's rules by prematurely identifying Pakistani paceman Mohammad Asif who failed a dope test during the Indian Premier League in India. BCCI's chief administrative officer Ratnakar Shetty said the Board has followed all the correct procedures and taken the right step by naming Asif.
Russian Olympic medallist Alexander Krushelnitsky has denied taking a banned substance in a suspected doping case that has rocked the Pyeongchang Winter Games and could imperil Russia's efforts to regain its full Olympic status.
Italian anti-doping authorities have called for two-year bans on 26 athletes, including Olympic bronze medallist Fabrizio Donato and European champion long jumper Andrew Howe, for allegedly failing to provide doping samples.
Athens Olympics silver medallist Rajyavardhan Singh Rathore says instead of clashing with WADA on the 'whereabouts' clause, the ICC and BCCI should formulate a dope testing norm that is better suited to the sport and ensure regular testing to keep the sport free of dope-criminals.
The representative of the World Anti-Doping Agency in Pakistan on Monday slammed the Indian Premier League organisers for prematurely identifying the player who failed a dope test during the tournament.
Indian Premier League commissioner Lalit Modi has confirmed that a player tested positive in the World Anti-Doping Agency 's random dope test, conducted during the inaugural Twenty20 tournament in India.
Russian gymnasts must be allowed to compete in the Olympic Games and not tarred with the same brush as the country's banned track and field athletes, the International Gymnastics Federation (FIG) said on Monday.
Pakistan's provisional squad for the World Cup in the West Indies also included Shabbir Ahmed who last month completed a 12-month ban for having an illegal bowling action.
The verdict in Maria Sharapova's appeal against a two-year doping ban will be announced by the Court of Arbitration for Sport (CAS) on Tuesday.
Valieva failed the test collected at the Russian national championships on Dec. 25
The Court of Arbitration for Sport (CAS) will make a final ruling this week on "selective" doping bans handed out to six Russian athletes, including four Olympic champions.
The world governing body for athletics (IAAF) fought back on Tuesday against media reports of suspected widespread doping in the sport, rejecting accusations it failed to investigate dubious drugs test results properly.
Manager Emanuel Hudson said the 23-year-old had not recovered from his exertions the previous night when he ran a personal best of 9.76 seconds.
Euskaltel-Euskadi's Russian rider Alexander Serebryakov has been suspended after traces of the blood booster EPO were found in his urine, the International Cycling Union (UCI) said on their website.
Sports Minister Ajay Maken is hoping that the BCCI would have no objection to the new draft of National Sports development Bill, which could not be passed earlier in the Cabinet after some of the ministers objected to it.
Chinese Olympic women's swimmer Chen Xinyi tested positive for a banned substance at the Rio Olympics on August 7, state media said on Friday citing the country's swimming association, the latest doping scandal to mar competition at the Games.
In the biggest ever series of cyber attacks uncovered to date, hackers were found to have broken into the networks of the Indian government, the United Nations and United States defence companies.
Spaniard Marta Dominguez Marta Dominguez has been stripped of her 2009 steeplechase world title and banned for three years due to anomalies in her biological passport that pointed to doping, the Court of Arbitration for Sport (CAS) said on Thursday.
The World Anti-Doping Agency is not fit for purpose and should be replaced, Britain's double Olympic decathlon champion Daley Thompson has said following its decision last month to lift a ban on Russia's anti-doping body.
Kamila Valieva is one of the youngest Olympic athletes to test positive for a banned substance
World Anti-Doping Agency (WADA) moves fast, but one thing is clear drug cheats and pharma companies helping them break records are definitely faster than WADA.
Russian figure skater Kamila Valieva will be allowed to compete in the women's singles in figure skating at the Beijing Olympics after a decision by sport's top court on Monday.
Both players have been told to stop talking to the media before their appearance next week at a doping tribunal.
The World Anti-Doping Agency (WADA) has approved the list of prohibited substances for 2011 with several changes made from previous year, including addition of a section to address abuse of pharmacological substances, removal of mandatory Declaration of Use for specific substances not prohibited.
The risk ratio for winning a medal with a TUE, according to WADA, was 1.13.
The decision not to impose a blanket ban was not uniformly welcomed with Travis Tygart, head of the United States Anti-Doping Agency, describing it as "yet another devastating blow to clean athletes."
Bowing to the BCCI's objections, the Sports Ministry on Monday decided to exempt cricketers from some World Anti-Doping Agency rules, including the contentious 'whereabouts clause', in the revised National Sports Development Bill.