The Lilywhites have looked very secure, and that has helped them go unbeaten through their last 11 fixtures.
Pochettino feels that a major reason behind Spurs’ defensive record has been due to the form of Vertonghen.
Even though Spurs have added Toby Alderweireld this summer, and the likes of Ben Davies, Danny Rose and Kyle Walker have all been in good form, Pochettino still considers Vertonghen to be the most important part of his backline.
The Belgian international has been linked with Inter Milan, but the Star claim that Spurs have no intentions of selling and the defender is said to be happy at White Hart Lane, as the side aim to break into the Champions League.
Tottenham are currently in fifth place in the Premier League table, but they are just three points away from the top-four, and optimism is high around the North London club.