Arsenal could be without Cesc Fabregas for their next three games after the midfielder suffered a hamstring injury during the 3-1 defeat by Sevilla on Tuesday
The 20-year-old Spain international, who has played a pivotal role in their excellent start to the season and scored 10 goals, limped off after 56 minutes of the Champions League clash.
Boss Arsene Wenger said: "It is a hamstring injury. We'll know more on Thursday morning."