The Portuguese returns to football 11 months after being sacked by Manchester United and succeeds Pochettino who was relieved of his duties on Tuesday evening.
He signs a three-and-a-half contract with the club and cannot wait to get started.
“I couldn’t be happier and if I was not as happy as I am, I wouldn’t be here,” he told Spurs TV.
“What can I promise? Passion – for my job but also passion for my club. It’s a privilege when a manager goes to a club and feels that happiness in relation to the squad he’s going to have.
“These are not words of the moment. They are not words of me being the Tottenham head coach. These are words that I’ve told and I’ve repeated in the last three, four, five years even as an opponent.
“To play against Tottenham at White Hart Lane was always hard but beautiful. It was one of these places where I used to go with passion but also with respect.
“I always spoke about the club’s potential. I always spoke about the qualities of the players. I always spoke about the magnificent work the club was doing.
“I really like this squad and looking to the young players, there is not one manager in the world that doesn’t like to play with young players and to help young players to develop. There is not one.
“The problem is that sometimes you get into clubs where the work that is below you is not good enough to produce these players so I look to our history and you see that the academy is always giving the talents that the first team need.
“Of course I look forward to working with that profile.”
Mourinho, who took training for the first time on Wednesday afternoon, is excited to get started and believes he is now part of one of the best clubs in the game.
“When you say beautiful stadium you are too humble,” he added. “You have to say the best stadium in the world. I think that is the reality. The training ground is second to none. It probably can only be compared with some American football training grounds.
“You cannot compare football at any level – and I’ve been in the majority of the best places. It’s impossble to compare anything the same as the stadium. I think it’s something that has to make us all very, very proud.
“But not just that, the conditions you have to work are absolutely amazing. In relation to the Premier League I think we know where we are and we know that we don’t belong there.
“We should just play match after match, the next watch we want to win and that’s the same about the next, and the next and the next until the last.
“At the end of the season we will saee where we are but I know that we are going to be in a different position than we are now.
“I look forward to the challenge, to the responsibility to bring happiness to everyone that loves the club.”