The Gunners captain announced on Thursday at London Colney that he would not be travelling to the United States
Arsenal have started disciplinary proceedings against Laurent Koscielny after the club captain refused to travel with the squad for their pre-season tour.
The Gunners fly to the United States at lunchtime on Thursday, but will travel without their skipper who stunned club chiefs by turning up at London Colney on Thursday morning and announcing he would spend the day training and that he would not be joining the rest of the squad on the coach to the airport.