Newcastle United and Sunderland were represented at Ajax's victory over PSV Eindhoven on Sunday.
Dutch sources say the subject of their interest was PSV attacker Jeremain Lens.
Lens has declared this could be his final season in the Eredivisie. A January departure hasn't been ruled out with talks ongoing between PSV and Lens' representatives.
Football Is Life
Share The Love
Stay in touch with Tribal news, updates and special offers direct to your inbox