New Delhi: India's floundering campaign in the Rio Olympics took a turn for the worse when the World Anti-Doping Agency (WADA) lodged an appeal with the Court of Arbitration for Sports (CAS) against the clean chit given to wrestler Narsingh Yadav by NADA in the dope scandal back home.

"Yes, WADA has appealed the verdict on Narsingh to CAS, which will hear both parties on Thursday August 18," Brij Bhushan Sharan Singh, Indian wrestling's governing body president, told IANS on Tuesday.