Mathieu Debuchy is facing three months out reducing Arsenal’s defensive options.
Arsene Wenger fears Debuchy will be missing until Christmas after suffering significant Ligament damage when the sprained his ankle during Arsenal’s game with City.
Calum Chambers will take his place at right-back and will play against Dortmund on Tuesday, this might be a problem for Arsenal because the England youngster is the only back up for centre-halves Per Mertesacker and Laurent Koscielny.
Debuchy will know the full extent of injury of his injury on Monday. Should the result be as bad as feared, Arsenal might consider bringing in a free agent to fill the void.