Champions Manchester United have already spent heavily as they prepare for the defence of their crown, as have Liverpool who are looking to return to the top four.
Manchester City will likely again invest some of their considerable wealth for a renewed title bid but Chelsea have yet to make any big-name signings despite being heavily linked with Tottenham's Luka Modric.
But with the start of the season just over two weeks away, Villas-Boas remains relaxed about the situation.
"You have to take into account in six years the amount of trophies this club has won and the dramatic change this club has suffered in the last eight years, it was a dramatic change that brought success," he said.
"It doesn't mean that we are not looking to strengthen the squad or to bring players in, it just means a different approach to the market. We have 15 more days before Stoke and 31 days before the market closes.
"The players are not under assessment because they are successful on their own, it just means we need to evaluate the sectors that we might need strengthening and try to do it wisely and properly.
"On that front we are pretty happy and in August I think we will take the decisions that we need to take for us to be ready for the first day of the season."
Source: Team Talk
Source: Team Talk