The International Tennis Federation has said that Croatian player Marin Cilic has been suspended nine months for a doping violation.
The suspension was back-dated to May 1, so Cilic will be able to return to the tennis circuit on January 31.
Cilic tested positive for nikethamide, a stimulant, in Munich.
The ITF says an independent tribunal found that Cilic "ingested the nikethamide inadvertently, as a result of taking the Coramine glucose tablets and did not intend to enhance his performance in doing so."
Cilic has not played since withdrawing from Wimbledon in June.