The Central Bureau of Investigation (CBI) on Tuesday registered a case against wrestler Narsingh Yadav to probe the allegations of doping lodged against him.

"We have registered a case against Narsingh Yadav and started a probe against him regarding allegations of dope consumed by him ahead of Rio Olympics," CBI spokesperson R.K. Gaur told IANS.

Yadav had tested positive on June 25 for a banned substance ahead of the Rio Olympics, which began on August 5 in Rio de Janeiro, Brazil.

The Wrestling Federation of India (WFI) had come out in Narsingh's support on the issue and on September 16 had referred the alleged dope case to the CBI for a detailed probe.

After arriving from Rio de Janeiro, WFI President Brijbhushan Sharan Singh requested the Prime Minister's Office that the probe be carried out by the country's premier investigating agency.

The complaint was later forwarded to the CBI.

Yadav had alleged that a fellow wrestler had hatched a conspiracy against him to sabotage his chances of clinching a medal at the Rio Olympics.

He had alleged that a couple of junior wrestlers had mixed banned substances in his food that led to the positive result in the dope test.

He was cleared by the National Anti Doping Agency (NADA) and had travelled to Rio for the Olympics.

However, he ran into trouble with the World Anti Doping Agency (WADA) in the Brazil capital and was barred from competing at the Olympics just hours before his first bout.