Defender Johan Djourou has been released from the Switzerland squad to return to Arsenal for treatment to a knee injury.

The 22-year-old is suffering from inflammation in his left kneecap and will miss tomorrow's friendly against Italy in Basle as a precaution.

Switzerland coach Ottmar Hitzfeld told the Swiss FA's official website: "We don't want to take an unnecessary risk shortly before the start of his club's season."