The Court of Arbitration for Sport says it is unlikely to rule on a new case examining Swiss club FC Sion's FIFA transfer ban before the signing window closes this month.

Sion recruited six players in the offseason in apparent defiance of a FIFA punishment, but has been blocked from fielding them.

CAS says it is unlikely to be able to rule on Sion's latest appeal, against the Swiss league, before Aug. 31.

Sion, which faces Scotland's Celtic in a Europa League playoff on Aug. 18 and 25, could be left holding players it can neither select nor sell until January if the appeal is lost.

Sion's legal troubles began when it lured Egypt goalkeeper Essam el-Hadary to break his contract with Al-Ahly in 2008.