The striker is a top target for Newcastle United.
"Luuk has taken the decision to move on," agent Louis Laros told TC Tubantia. "He wants to develop as a player in a bigger league.
"The important thing for us is the development of Luuk. Not the money, but the way of playing and the amount of playing time he will get will be decisive.
"Luuk scored 25 goals in the Dutch league last season, how many more does he need to score? 35?"