The Dutchman asked to leave last June when Valencia made a club record offer for his services, although Hamburg coach Huub Stevens vetoed the deal. He has since been in impressive form as Hamburg challenge at the top of the Bundesliga table, but the 24-year-old has now refused to commit his long-term future to the club.
"I am not signing," he told the Bild newspaper. "I will not extend my contract."
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