Paulinho has become Andre Villas-Boas' first summer recruit as he looks to reshape his squad ahead of a push for a top-four place in the Barclays Premier League next season.
"It's a huge pleasure for my career to be at a club as big as Tottenham. I know it will be a huge challenge but I think I can help all my colleagues to succeed and give a lot of happiness to the supporters," he said.
"The training centre is amazing and I'm very impressed about the conditions Tottenham offers to the players. I will focus on my job and use the facility as much as possible.
"We used to watch the Premier League in Brazil - including Tottenham - and this club has big players. I just want to help them to succeed here. It's nice to have another Brazilian in the squad and I'm excited to meet with Sandro and all the players."