Villas-Boas has seen Louis Saha and Emmanuel Adebayor depart the club this summer but has said that any new signings must be considered and not rushed.
"In this market it's important to make good, sound bids, not just to do anything for the sake of it," Villas-Boas told Sky Sports News.
"We are hopefully moving in the market in the next couple of days or weeks.
"We're just trying to make the best decisions possible before the start of the league - hopefully trying to solve the issue with one more striker before the Newcastle game."
Villas-Boas became Spurs manager early last month.