The Dutch football international suffered from hernia on both his right and left groin in the past half year. He underwent surgery in the Erasmus hospital in Rotterdam Thursday, reports Xinhua.
Despite the pain, Schaken played 17 Eredivisie matches so far this season in which he scored two times. Due to the injury he is about to miss the start of the second half of the Eredivisie season, including the matches against Ajax (Jan 20), FC Twente (Jan 27) and PSV Eindhoven (Jan 30, Dutch Cup).
Schaken will also not be eligible for the Netherlands friendly against Italy Feb 6 in Amsterdam.