Maas Willemsen, a 23-year-old Dutch central defender who plays for SC Heerenveen, has been extensively scouted by the 'top four' clubs in the Netherlands over the past months. Several German and Italian clubs are reportedly also monitoring him. Willemsen, who joined his current club in July 2025, has a contract until mid-2029. His current Transfermarkt market value is €1.50m.