Arsenal midfielder Samir Nasri will be out for up to three months after fracturing his right fibula in pre-season training.
The injury was sustained at a training camp in Austria.
The 22-year-old France international joined from Marseille in 2008 and made 44 first-team appearances in his first campaign in English football.
He scored seven times, the first goal coming seven minutes into his debut against West Brom.
The Frenchman's injury will disrupt Arsene Wenger's new season plans, although midfielder Tomas Rosicky has returned to fitness.
The 28-year-old Czech has missed the past 18 months with a combination of knee and hamstring injuries.
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