Arsenal have only 3 fit defenders going into tonight’s Champions league opener with Borussia Dortmund in Germany. Calum Chambers has tonsillitis ands a decision over his participation maybe made this morning while Nancho Monreal has been left at home with back injury and Mathieu Debucy is out with a leg injury. That means Mathieu Flamini may have to fill in a right back or 19 year old Hector Bellerin may start for the first time. Arsene Wenger has been talking about the young player among other subjects alongside his goalkeeper Wojciech Szczesny.