Vertonghen can either be very, very good or very shaky at the back but this season really seems to be maturing into a top defender.
The stability that Spurs gain with the former Ajax player in their side is massive and Vertonghen is becoming a leader on and off the field as well.
Buying new players is all well and good but you have to work with what you have and keep a core of players who know the club and want to play for the badge and Vertonghen is becoming one of those men.