كتب : Amro Hassan
The French international picked up the injury on Tuesday in Austria, where the Gunners are holding a pre-season camp.
The news means that Nasri will miss Arsenal's start of the Premiership season, as well as France's World Cup qualifiers against Romania and Serbia in September.
Arsene Wenger's men have been marred by injuries last season, as Tomas Rosicky, Eduardo and Willam Gallas were all out of the game for long periods.