Chelsea manager Jose Mourinho has described his club's lack of transfer activity this summer as "dangerous" but ruled out panic signings.
Colombia talisman Radamel Falcao and goalkeeper Asmir Begovic remain the only high-profile summer buys in at Stamford Bridge amid of backdrop of big spending by Chelsea's title rivals.
"You don't need to buy 10 players to be a better team. You can be a better team with one or two new players and be a better team, with the same people."Jose Mourinho
The 52-year-old said he was worried a quiet close-season could come back to bite the champions but insisted he will not be rushing to the market to make a raft of late signings.
"It's dangerous," the Portuguese manager told reporters.
"I think that saying, is right, the saying that: 'If you stand still, you get worse'. It's right, but the same people can move forward.
"You don't need to buy 10 players to be a better team. You can be a better team with one or two new players and be a better team, with the same people."
The west Londoners announced on Friday former Real Madrid and Inter Milan coach Mourinho had signed a new four-year contract with the club and the manager said the onus was now on the players to prove their title defence credentials.
He said: "The biggest advantage I hope is for the players to think: 'My club and my manager trust me so much. They were so loyal to me and they want to show me they have a good memory and they don't forget what I did last year. They don't spend loads of money, they don't sell me, they don't kick me out, they want to keep me, they believe in me, so now it's my time, it's our time to give it back. To give my manager and my club a proper answer'."
Chelsea are currently priced 1/1 in the Premier League outright winner betting and 1/1 to win next season's Champions League.
Don't forget all Premier League matches are covered by the bet365 Euro Soccer Bonus, where you could earn a bonus of up to 100% on your returns on pre-match accumulator bets. T & Cs apply.
View all Soccer betting