Arsenal defender and Switzerland international Johan Djorou will be out of action for about six months after he underwent an operation on his left knee, the Swiss football federation said yesterday.

Djourou followed doctors' advice and was operated on his knee cartilage in Geneva on Friday, the federation said on its website.

The 22-year-old had been hoping for a permanent slot in the Gunners' extremely competitive back four following the departure of Kolo Toure over the summer.

But he quit the Swiss training camp before a friendly against Italy last month complaining of a revival in a recurrent knee pain.

Djorou hopes to regain fitness for a return to competitive football next March, in the hope of making it to the World Cup in South Africa in 2010 if Switzerland qualify.

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