Five-time grand slam champion Sharapova, 29, announced in March that she tested positive for meldonium at January's Australian Open.
A two-year ban was imposed in June, back-dated to January, and she appealed to the Court of Arbitration for Sport, seeking a reduction.
A hearing had been scheduled for next Monday but a CAS statement on Tuesday read: "The Court of Arbitration for Sport will issue its decision in the arbitration procedure between Maria Sharapova and the International Tennis Federation (ITF) during the first week of October 2016."
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