AZ say Alves had agreed in principle to join them during the transfer window, but the Alkmaar club failed to reach a deal with Heerenveen by December 31 and the player instead decided to join English Premier League outfit Middlesbrough.
The case between AZ and Alves has gone to arbitration and the club´s lawyer, Eric Vile, said: "We are claiming this amount of money on the basis of FIFA´s rules."
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