Real Madrid have been ordered to pay Inter Milan an extra eight million euros (5.3 million pounds) relating to their purchase of Brazil striker Ronaldo in 2002.
The Court of Arbitration for Sport issued the decision on Friday following a hearing on Thursday at which Real had appealed against an order by world body FIFA to pay a 10 million euros settlement to Inter.
Ronaldo moved to Spanish side Real in August 2002 in a deal worth 35 million euros which also included midfielder Santiago Solari in part-exchange.
The 35 million was paid but Argentine Solari refused to move to Inter in January 2003, prompting the Italian club to appeal to FIFA.
FIFA ordered Real to pay Inter 10 million euros for the incomplete move of Solari, but Real appealed to CAS in March 2004 over the decision.
CAS said in a statement on Friday: "Real Madrid and Inter Milan...have decided to settle the controversy related to the interpretation of the transfer agreement of Ronaldo to the Spanish club, and concerning the position of the player Solari.
"Real Madrid shall pay eight million euros to Inter Milan, divided as follows: seven million euros by June 30, 2004 and 1 million euros by June 30, 2005."
The judgement has been approved by both Real Madrid and Inter Milan, CAS said.