The France captain moved to White Hart Lane on Friday and was expected to replace the American, but the Portuguese coach confirmed the 41-year-old will keep his place after a fine showing in Spurs' 1-1 draw with Norwich on Saturday.
Villas-Boas told Sky Sports: "[Friedel] had an amazing game, you have to give credit to him. It was a man of the match performance, he saved us a couple of times from going 1-0 down, it was so outstanding.
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Spurs are still awaiting their first win under the 34-year-old, but Villas-Boas was happy with his side's second-half showing despite failing to break down a stubborn Norwich side.
"I think it's normal [to wait for first win]. It comes normally with hard work and we continued to work hard today," he added.
"I think the first half we weren't so sharp, like last week we didn't create lots of opportunities, so today was a little bit different.
"Second half we improved a lot, managed to have more of the ball and were creative. We fought hard to get the goal that we deserved but in the end suffered again on a set play.
"I think it's obviously disappointing start for everybody, but we look to repay our fans with the win they thay deserve and the team deserve, we will continue to pursue that.
"I think it was down to Norwich being outstanding today, really proving that you can create good opportunities when you are playing away form home.
"They were very sharp, objective in their game, always creating us problems so we give credit to them, they found their inspiration from the amount of chances they had.
"We always looked a bit on the back foot in the beginning but improved a lot in the second [half], but not enough at the end to take the result we wanted."