Arsenal manager Arsene Wenger has revealed that Mikel Arteta could be sidelined for "approximately three weeks" through injury.
The Spanish midfielder was forced to miss Sunday's 2-0 defeat to Manchester City in the Premier League with a calf strain.
The 30-year-old could miss up to five matches for the Gunners as he regains fitness.
Arteta has scored four goals in 26 appearances for Arsenal this season.