The 41-year-old Dutchman has made a big impression at Anfield under manager Arne Slot who appointed his compatriot with a nod to his Premier League experience.
The winger arrived on Merseyside in August for an initial £10million fee, which could rise to £12.5m based on add-ons, as the only major arrival of Arne Slot's first transfer window.
Ange Postecoglou maintains the backing of Tottenham's board but the League Cup semi-final against Liverpool is emerging as key to the Australian's prospects..