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"And, personally, I also think that they should be in prison," Banka added.

Valieva was cleared on Monday to compete in her next event at the Beijing Olympics by the Court of Arbitration for Sport (CAS) after a failed drug test last December, although CAS did not rule on the doping case itself.

The case is now in the hands of the Russian Anti-Doping Agency (RUSADA), which has to set up a hearing to decide the fate of Valieva, hot favorite for the women's singles in Beijing.

"We demand that RUSADA complete a strong investigation into the entourage behind the athlete in this case. So, our intelligence and investigation will also look into that. We will make sure that proper investigations is carried out," said Banka.