Viktor Troicki, the Serbian tennis player, has today appealed to the Court of Arbitration for Sport against the 18-month ban handed to him by the International Tennis Federation for a doping violation.
The 27-year-old provided a urine sample, but failed to provide a blood sample during the Monte Carlo Masters in April. He was subsequently banned by the ITF last month.
CAS said that Troicki has not filed a request for a stay of the challenged decision, and as a result he remains suspended.
The Lausanne-based court added: "The CAS procedure is in progress and a decision will be issued in around four months, in accordance with the applicable time limits set out in the CAS rules."
Troicki, who reached a career-high number 12 in the world in June 2011, claimed he had asked for permission to be excused from the blood test because he was feeling unwell, but the ITF rejected that explanation.
If the ITF decision is upheld by CAS, Troicki's suspension will end on January 24, 2015.