The Alkmaar side's head coach ordered his players off the pitch after the referee dismissed his goalkeeper following a confrontation with a supporter that had ran onto the pitch
An Ajax fan entered the pitch after 38 minutes of play and ran towards the AZ goalkeeper attempting to land a kick towards the face of the Costa Rican - who proceeded to kick the fan to the ground before again kicking him while he was on the ground.
Onrushing stewards then intervened and took the Ajax supporter away but referee Bas Nijhuis consequently showed the AZ keeper a straight red card for misconduct, much to the dismay of coach Gertjan Verbeek.
Verbeek then entered the pitch and ordered his players to leave the field of play and head for the dressing rooms.
Representatives of both sides and match officials have decided to cancel the game, and it is yet unclear what the consequences will be for AZ or whether the fixture will be rescheduled for a further date.