"The club can confirm Philippe Senderos underwent surgery on his Achilles tendon in Finland today," the Premier League team said on their website on Wednesday.
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"The surgery went well and the club are hopeful of a return to training within six months."
Senderos, who left Arsenal in June, pulled out of Switzerland's squad for Wednesday's friendly against Austria due to a minor toe injury.
"It's incredibly bad luck for Philippe. A hard blow to him personally, for his club but also for the national team," coach Ottmar Hitzfeld told the Swiss FA's website.
Senderos was in Switzerland's World Cup squad but managed just 36 minutes of action after injuring his ankle in a surprise victory over Spain in their opening game.
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