The 25-year-old Belgium international moved to White Hart Lane from Dutch giants Ajax in the summer and has been a success in a number of roles for Andre Villas-Boas' side so far
Comfortable at both left-back and centre-back, the 25-year-old has been at his versatile best so far this campaign in helping to cover the long-term absences of both Younes Kaboul and Benoit Assou-Ekotto who have been sidelined with injury.
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"I wanted to be ready when I came to the Premier League and I felt ready when I came to Tottenham," Vertonghen told the club's official website.
"I think I’ve done okay, but you haven’t seen my best yet. I think I can improve.
"I’m happy with my first six months, played a lot of games, feel the confidence of the players, staff and supporters as well.
"After six months, I think I can be happy with my performances. The fans have been very supportive, I love them as well."
The Belgium international has appeared in 19 of the club's 21 Premier League games this campaign and 26 out of a possible 30 across all competitions on his way to helping Andre Villas-Boas' side up to third in the league table.