Adrian Mutu has filed an appeal with the Court of Arbitration for Sport against FIFA's order to pay £13.84million compensation to Chelsea.
FIFA handed down the order in May, telling the Fiorentina and Romania forward that he must compensate the club that sacked him in 2004 following a positive test for cocaine.
A CAS statement said: "Mutu requests the CAS to annul the FIFA Decision and to establish that no compensation is in fact due."
No date has yet been set for a hearing.
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