Chelsea head coach Carlo Ancelotti refused to be too concerned despite seeing his side beaten 3-1 by Manchester United in the Community Shield at Wembley.
The loss was the Blues' fourth consecutive setback during pre-season, with Ancelotti's men having also been beaten by Ajax, Eintracht Frankfurt and Hamburg.
The Italian told reporters: "I am not worried. We have improved, we may have to improve more and we have to have more time in possession.
"We played too slowly at the start and we didn't have the possibility of finding our play in the first half, so for this reason we have to work.
"They played better than us and they deserved to win, we knew Manchester could play a good game. They did that and they deserved it.
"But importantly now our players are very close to being fit.
"This was Michael Essien's first game of 90 minutes for eight months and Frank Lampard and John Terry played 90 minutes each.
"They need more time, which is why it is good for them to play a national team game this week.
"They could play 70 minutes without a problem. Naturally they have to improve still, but within one or two weeks they will be fully fit.
"It was not a good pre-season. We knew it was a difficult pre-season, but we are disappointed - we don't want to lose these games."