The highly-rated 22-year-old has put his name to a two-year extension that ties him to the club until the summer of 2004.
Van Nieuwstadt has been a regular starter in Hans Westerhof`s team this term, and his efforts have prompted talk of a potential international call up in the not too distant future.
The defender will be looking to help Willem climb up the table in the second half of the season, and increase his standing in the Eredivisie at the same time.
