A South African batsman Vaughan van Jaarsveld has tested positive for a banned stimulant sibutramine.
But the South African Cricketers' Association chief executive Tony Irish says van Jaarsveld might not be at fault because sibutramine is commonly found in medicines including dieting tablets the player's doctor prescribed.
Sibutramine is an appetite suppressant and on the World Anti-Doping Agency's banned list.
Van Jaarsveld's positive test comes the day after Springbok rugby players Chiliboy Ralepelle and Bjorn Basson arrived home after being suspended for testing positive for a banned stimulant methylhexaneamine.
The Springboks are still trying to determine the source, fearing it could have come from contaminated supplements the whole squad's been taking.