Maria Sharapova's failed drugs test was "reckless beyond description", according to former World Anti-Doping Agency president Dick Pound.
Sharapova, 28, revealed on Monday that she tested positive for the banned substance meldonium in January.
A number of sponsors have already distanced themselves from the Russian five-time Grand Slam winner.
"Running a $30m business depends on you staying eligible to play tennis," Pound told BBC Sport.
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