Mathieu Debuchy suffered a cruel injury blow on Sunday as he limped out of the game against Bournemouth after just 15 minutes.
The 31-year-old had not started for the Gunners in a year, spending the second-half of last season on loan at Bordeuax, but saw his Arsenal comeback cut short when he went down with a hamstring problem.
Arsenal had just taken the lead through Alexis Sanchez, before the France international was forced off injured. Arsene Wenger brought on Gabriel in place of Debuchy at right-back, and will await news on the severity of his injury.
Debuchy last played for Arsenal in November 2015, coming off the bench in the Gunners' 3-0 Champions League win over Dinamo Zagreb.