Lucas left PSG in January for Spurs.
"In Paris I had five fantastic years and then something broke and the last six months were difficult," he told Gazzetta dello Sport.
“Now is not the time to speak of certain things. I will just say that I am happy with the choice I made. Tottenham is a club of the future There are players of international stature like Kane, Eriksen, Alli and Son.
"There is a young coach who is prepared and ambitious. It is a club with an modern infrastructure. In football you don't become big by chance. Plans are fundamental."