Arsenal's defensive injury crisis deepened as Nacho Monreal was forced off against Burnley in the first half.
The left-back looked in discomfort as he came off for Stephan Lichtsteiner, causing another headache for Unai Emery.
Monreal is one of the key performers in the team and fans will hope the Spaniard was only taken off as a precautionary measure.
His absence will be a huge concern as the Gunners have suffered a number of injuries in recent weeks.
In defence, Hector Bellerin has been ruled out for at least another fortnight and Laurent Koscielny is still working his way back to full fitness.