Vertonghen last week completed his move from Ajax.
"I am delighted to be here," he told Spurs TV. "Over the last years Spurs have become a very big club in England.
"They finished in the top four a few times and for me it was one of the best clubs in the Premier League and that is one of the reasons I wanted to come here.
"There is a lot of quality and I think everybody wants to make a good season.
"Last year in the first six or seven months, they were up there for the title, the championship.
"After that it was not that well, but this year I think we will compete a few more months longer."