Scouts from Fulham were present at AZ Alkmaar's recent match against Shakhtar Donetsk in the UEFA Cup.
Jan Kronkamp (24), Denny Landzaat (28) and Joris Mathijsen (24) are all being linked with moves away from Holland.
Arsenal, Man U, Crystal Palace, Newcastle, Bolton, Charlton, Villa, Real Madrid, Valencia, Milan, Depor, Schalke 04, SV Hamburg and Monaco are also thought to be interested in the talented trio.
Landzaat is the most likely to be sold in the summer, but the asking price for the midfielder is around 12m Euros.
Krompkamp will cost 15m Euros while the price tag on Mathijsen's head is 10m Euros.
AZ's 33-year-old keeper Henk Timmer has also earned rave reviews and attracted interest from some of the above mentioned clubs.
Kronkamp is the player most coveted though, and the defender won his second full Holland international cap against England recently.
But the stopper's under contract until 2008, hence the massive fee expected for his services.
Mathijsen is also a defender and cheaper option than Kronkamp - who's widely regarded as one of the hottest young talents in Holland.