Kane spent most of last season on loan at Millwall and has yet to make his Premier League debut and only featured for Spurs in the Europa League.
Villas-Boas said: "Kane is a young striker who we believe in and who we trust for the future.
"We think he can be a part of our plans. I can give you an example. Last year we had two strikers in Chelsea of great dimension.
"Tottenham had three strikers of great dimension, Adebayor, Defoe and Pavlyuchenko.
"Normally there is one that doesn't get enough time that he feels he should be credited with.
"That's not because you don't rotate enough, but because when you play a system with one striker, it is very difficult to get the third one to play enough.
"Normally, on my teams, I like to promote the third one as a young striker who is competing for that place a bit more aggressively."