Blues have now scored 21 times in their first five Premier League wins following the 4-0 thrashing of Blackpool.
"We haven't played against the top teams but I think we are playing very well and that is the most important thing," said Ancelotti.
"Now it is important to maintain the same level of play against the top teams and I think we are able to do this.
We have confidence. We know very well that the next game will be more difficult but if you are able to show the same level of football also away against a fantastic team like Manchester City, I think it is an important test. But it an important test not just for us but for them."