Townsend has signed a new four-year contract.
Spurs boss Andre Villas-Boas said: "We're very proud of what he has done, (we have) seen him play with so much confidence and determination he's really set his place in the team, for Tottenham and for his country.
"It's performances like this that keep your place in the team.
"Whenever he's been called up by myself or Roy he's given great performances.
"At the moment we're very happy with what he's been doing and I think Roy thinks the same.
"It's wonderful for him. He's come along with the explosion he had in the Premier League, not just with Tottenham but with his country.
"He is doing extremely well for club and country and deserves credit."
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