With Spurs' Champions League qualification out of their own hands heading into Sunday's final match against Sunderland, there have been concerns that the Welsh forward may leave the club.
But Villas-Boas remains confident the 23-year-old will sign a new contract and become the symbol of a bigger future for the club, though he admits the very top players available may be out of reach.
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"This summer, we will be adding quality players, I think. We can't compete at the level that others go for in terms of the big names that are around and the players that you expect to be moved for having done well during the season.
"We are in a different type of market and we have to scout properly to get good names from around the world and the Premier League."
The 35-year-old also added that he would prefer to secure his summer signings before the season starts.
Last year, Clint Dempsey and Mousa Dembele both joined on August 31, a matter of hours before the transfer window slammed shut.
"I think as you will agree we have done things like that in the past and you will also agree that this club has managed to get some great coups at the end of the transfer market," he added.
"But ideally, when you set up for the first game of the season, to have put the team to bed would be the ideal situation."