Juventus and Livorno have appealed to the International Court of Arbitration for Sport (CAS) against FIFA's decision to help Adrian Mutu pay Chelsea the €21,5m compensation he owes to the club following a positive doping test in 2004.
FIFA ruled earlier this month that the Italian clubs were equally responsible for Mutu's debt to Chelsea.
CAS ordered Mutu at a third hearing in 2009 to pay Chelsea more than €17m in damages, but this sum has since risen to €21,5m with interest.
During that trial, Mutu received support from the Professional Footballers' Association (FIFpro) who advised that Juventus should also share in the compensation.
Mutu joined Juventus as a free agent in 2005, having previously been registered as a Livorno player while serving a seven-month suspension in England.
Juventus then earned eight million dollars by selling Mutua to Fiorentina.
Thirty-four-year-old Mutu now plays for Ajaccio.
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