Tottenham must up their bid for Ajax defender Davinson Sanchez.

De Telegraaf says Spurs are locked in talks with Ajax over a fee for the Colombia international.

Tottenham's last offer was for €40m, while Ajax are insisting on €50m to sell the defender.

Spurs are arguing Ajax should accept their offer given the fall of the pound sterling. But Ajax chief Marc Overmars refuses to budge.

Overmars is convinced they're in the boxseat as he also has contact with Chelsea and Real Madrid over Sanchez's situation.