Napoli say the decision to reject Kalidou Koulibaly's appeal against his red card against Inter is a wasted opportunity in the battle against racism.
Koulibaly was shown two yellow cards in quick succession during the 1-0 defeat at San Siro on Boxing Day, the second coming after he sarcastically applauding the referee.
The Senegal defender was targeted by racist abuse from the stands throughout the game in Milan and head coach Carlo Ancelotti said Koulibaly was "nervous and the mood at the time was not his best".
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Napoli said the game should have been suspended due to the taunts from the crowd and the club's lawyer vowed to fight any suspension.