Arsenal right-back Mathieu Debuchy fears he has suffered a 'severe' injury, manager Arsene Wenger says.
The 31-year-old made his first Gunners appearance since November 2015 in a 3-1 win over Bournemouth but a hamstring injury forced him off after 16 minutes.
"I have to speak to medical people, but you can only assess it really after 48 hours," said Wenger.
"You have to let it bleed and after, usually they have an MRI scan 48 hours later to see how big the damage is."
Prior to starting against Bournemouth, Debuchy's last outing for Arsenal came when he was a late substitute in a Champions League win over Dinamo Zagreb before he went on loan to French club Bordeaux.