City are now tip of the table after thrashing Tottenham this week.
Navas said: "We are top of the table and we are working really well, so we are focused on having to work like this every single week.
"We have to keep working like this, working really hard and, if we do it like this, then we are going to get the same results.
"This is the way we want to play, the way we want to perform, the way we're working on the training pitch. We are a team that has a lot of confidence and we have to keep it like this.
"Obviously there is pressure on us - we want to win the title. But there is nothing to worry about. It was a big win for us at Spurs and we are very pleased with that performance.
"It put us top and next Monday we have another important match against Chelsea, so it was really important to get a good result.
"Mourinho teams work especially hard, all the players do. He has a special, winning mentality so it is always difficult to face teams that Mourinho manages.
"But, as I said before, it was very important to get the three points and to be top of the table ahead of the match on Monday."
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