Indian shot putter Inderjeet Singh faces missing the Rio Olympics after his 'B' sample reportedly contained traces of banned substances.
The news comes after the Asian Athletics Championships gold medallist tested positive last month following an out-of-competition test on June 22.
Singh had been preparing to compete at the Olympic Games but his hopes of participating in Brazil are now in doubt, due to the B-sample failure.
He has been a regular medallist for India at continental level, having thrown a distance of 20.41 metres to win at the Asian Athletics Championships in Wuhan last year.
The news comes a day after compatriot Narsingh Yadav was cleared by the National Anti-Doping Agency (NADA) of a failed drugs test after the wrestler claimed his sample had been sabotaged.
The same has been claimed by Singh who protested his innocence in an interview with the Press Trust of India, where he claimed his supplements and water were targeted.
"This is a conspiracy and there is something wrong in it," Singh said.
“I don't want to comment on it but whoever has tried to raise their voice in this country, they are forced to shut up.
"My sample has been tampered with.
"Why would a player take something which is not good for his health?”
Inderjeet now faces a four-year ban from the World Anti-Doping Agency.