Arsenal fear midfielder Mikel Merino is set for a sustained spell on the sidelines amid concerns he has suffered a serious foot injury.
The 29-year-old Spain international missed Saturday's win over Leeds with manager Mikel Arteta saying the midfielder would see a specialist to determine a full prognosis.
The exact details of the injury will be confirmed over the next 48 hours but there are concerns Merino will be out for a number of weeks.
Arteta will be hoping for good news on Merino's absence in the coming days with his side facing crucial matches as they continue to compete in four competitions.