The 25-year-old, who sustained the injury in training last month, was operated on at a clinic in Barcelona, Barca said in a statement.
Netherlands coach Bert van Marwijk said last week he was convinced Afellay would be fit in time for next year's European Championship in Poland and Ukraine and that he was a key part of the squad.
‘The pure simplicity of the way Slot has managed the squad is probably the biggest thing I could say about him. It’s not broken, so let’s get on with it’: Liverpool legend full of admiration for Jurgen Klopp's successor at Anfield
‘I trained at Spurs and thought they’d give me a chance. But I received a letter thanking me but saying they didn’t think I was good enough – I was gutted’: How Tottenham missed out on signing Wales legend John Toshack
