Boulahrouz played for the Netherlands at two World Cups in 2006 and 2010 and for RKC Waalwijk, Hamburg, Chelsea, Sevilla, VfB Stuttgart and Sporting Lisbon at club level.
Feyenoord, who finished second in the Dutch league last season, begin their Champions League campaign in the third qualifying round later this month.
(Reporting by Mark Gleeson; Editing by Alan Baldwin)
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