Villas-Boas said: "He has to cope with the amount of attention he gets but he is very grounded and down to earth.
"I don't suppose he will have any problems. Before he went to England his confidence was high.
"What he has been doing for Spurs he did for England and now he is continuing for his club."
Townsend spent the second half of last season on loan at QPR, one of nine such temporary moves in his career.
Villas-Boas said: "I think the loan really worked for him. He came with the right frame of mind to grab the opportunity.
"I think he has shown all his drive and motivation to stay at Spurs this season and we are glad to have him."
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