Manchester United have already bought Holland winger Memphis Depay for £25million and are rumoured to be considering a £40m bid for Tottenham's Harry Kane.
Juventus midfielder Paul Pogba and Real Madrid's Gareth Bale, the subject of the world record transfer of £85m from Spurs, have also been linked with moves for astronomical fees this summer.
Chelsea did their business early last summer, with the key purchases of Diego Costa and Cesc Fabregas significantly aiding their title win with three matches to spare.
And Mourinho is in no rush to enter the bidding this summer.
"I expect to be busy walking from my towel in the sand to the water, swim a little bit and be back to the sun again
That's where I expect to be busy," said Mourinho, speaking ahead of Monday's game at West Brom.
"I'm in a different position to last season
Last season I was more than keen for my club to sell some players
At this moment I'm very happy to keep my players."
There will be some outgoings and incomings - "a little bit everywhere" - but Mourinho hopes goalkeeper Petr Cech will stay at Stamford Bridge despite being displaced as first choice by Thibaut Courtois.
Cech's agent, Viktor Kolar, has said the 32-year-old has been permitted to speak to other clubs, with Arsenal, Liverpool, Besiktas, Real Madrid and Paris St Germain reported to be interested in acquiring the goalkeeper.
"The base last year was to sell some to buy some
The base this season is to keep my squad," Mourinho added.
"I don't know that it's absolutely true what the agent is saying.
"Maybe it is, but the player has contract with Chelsea and Chelsea will have a very important say in the decision.
"I keep saying the same: I want my best players
Petr is one of my best players.
"I want my important players
Petr is one of my important players, so I would like him to stay and that's my position.
"Yes, I'm optimistic that he can be here next year."
Source : PA
Source: PA