The five-time Grand Slam champion tested positive for banned substance meldonium earlier this year.
The maximum punishment is four years – but it's believed it's more realistic she'd get a 6 to 12 month suspension.
That would rule her out of Wimbledon, the US Open and the Olympics.
Meanwhile, International Olympic Committee president Thomas Bach claims entire national federations could be banned from competing at future Games as a result of doping.
He says allegations of Russian state-sponsored cheating would represent a “shocking new dimension in doping” and an “unimaginable level of criminality” if proved.
Russia's already suspended from athletics.
Yesterday, the I-O-C announced 31 unnamed athletes face bans after doping samples from the 2008 Beijing Olympics were retested.
