Feyenoord have lost winger Tim Vincken for the rest of the season.
The 19-year-old has been forced to have a shoulder operation after he was injured two weeks ago.
Vincken has endured an injury plagued season and the shoulder problem is his fifth this term.
Meanwhile, the Rotterdammers have appointed Peter Houtman as their new striking coach.
Houtman will work with the club's youth strikers - whilst also being involved in media and commercial matters.
Houtman played 111 during his playing career with Feyenoord - scoring 77 goals.