"It's not my position to make public announcements, but there will be more cases," the agency cited Mutko as saying.
He also said that the ministry had warned Russian sports people before about meldonium being outlawed by the World Anti-Doping Agency.
Anastasia Myskina, the captain of the Russian women's tennis team said the team continues to support Sharapova.
(Reporting by Lidia Kelly; Editing by Christian Lowe)
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