Dos Santos said: "I know it is a very big club and the way it is going they can get even bigger in the future.
"I have been made to feel very welcome here and everyone is friendly. It is lovely to see Spurs fans wearing the shirt in London. It is obviously a big club with a lot of ambition.
"I came here because of the passion of the fans. It is a big club and I am very much looking forward to playing in England.
"For me it is a dream to come to a big club like Spurs. I have come here to explore my qualities. I have come from another big club and I want to give a lot for this new team of mine.
"As a young player I have come to a club where I have got a lot of opportunities. I believe any new player that arrives should give their all. I know most of the players in the changing room."