UEFA Champions League holders AC Milan will miss first-choice goalkeeper Nelson Dida in the match against Celtic on Wednesday. The Brazilian guardian is reportedly ruled out for at least 10 days with a shoulder injury that kept him out of the Rossoneri's 2-1 defeat at Palermo last week. Backup goalkeeper Zeljko Kalac is set to continue his role as Dida's deputy, despite the Australian's poor show in the Palermo defeat. Italian media also reported that manager Carlo Ancelotti might be forced to recall Christian Abbiati from his loan at Atletico Madrid in January. Milan are currently joint top of Group D in the Champions League with three points from one game, following their 2-1 win over Benfica 10 days ago.