The Rio Olympics-bound Indian contingent has been rocked by yet another doping scandal after star shot putter Inderjeet Singh tested positive for androsterone and etiocholanolone on 26 July.
Previously, Narsingh Yadav also tested positive for metadienone.
Singh, who failed the test which was conducted on 22 June, has alleged that it is a conspiracy against him since he has been critical of authorities in the past.
The National Anti-Doping Agency (NADA) has asked the athlete from Haryana - who won a silver in the 2014 Asian Games - to test his 'B' sample within seven days if he wishes to do so. If the 'B' sample also tests positive, he will have to miss Rio Olympics - which are scheduled to start on 5 August - besides facing the prospect of being banned for four years under the new WADA Code.
Singh is one of the first few track and field athletes who qualified for the Rio Olympics, having made the cut in 2015. He doesn't train at the national camps,choosing instead to train on his own with his personal coach.
He had a training stint earlier this year in the United States under funding of the Sports Ministry's Target Olympic Podium (TOP) Scheme.
He is a gold-medallist in the Asian championships, Asian Grand Prix and the World University Games last year.
--With inputs from PTI