Celebrated Chelsea scout Piet de Visser has questioned NAC Breda's relationship with Manchester City.
NAC, back in the Eredivisie this season, has six City players on-loan for the new campaign.
But De Visser told Omroep Brabant: "The problem with a large number of loan players is above all the fact that their presence comes at the cost of the home-grown.
"The youth training must never suffer. Our own talent must be stimulated. For that matter, I have trouble with it in the aspect of Willem II for a number of years has remained underexposed."
De Visser is also a former Willem II coach.