Romania international Adrian Mutu has lost his appeal and been ordered to pay former club Chelsea over £14million.
The Swiss Federal Court have upheld the decision made by FIFA and the Court of Arbitration for Sport in a legal battle which has lasted over five years.
Thirty-one-year striker Mutu, currently with Fiorentina, was sacked by Chelsea in September 2004 after testing positive for cocaine.
Mutu was handed a seven-month ban from football, prompting Chelsea to sue him as they aimed to recover the money they paid to sign him.
In a statement, the Swiss Federal Court said: "In a ruling on June 10, 2010, the Swiss Federal Court rejected the appeal formed by Adrian Mutu against the decision by the Court of Arbitration for Sport (CAS).
"The CAS ordered the Romanian professional footballer to pay a sum superior to 17million euros to his former employer, Chelsea Football Club Limited (Chelsea)."