Klass Jan Huntelaar opened the scoring for Ajax en route to their convincing 3-1 win over Gronigen.
Feyenoord won their second match of the new Eredivisie season, with Jean-Paul Boëtius' goal sealing all three points
Londoners interested in Fulham's Ryan Sessegnon, Ross Barkley of Everton and Celta Vigo midfielder Pape Cheikh Diop.
Ajax confirmed the 21-year-old would depart as Tottenham pay a transfer fee of €40 million (£36.6) that could rise to €42m (£38.4) with add-ons.
Tottenham have been linked with a number of right-backs as they search for a replacement for Kyle Walker, who has joined Manchester City.
Tottenham remain locked in talks with Ajax over Davinson Sanchez, but the defender has been named in the Dutch club's Europa League playoff squad.