While Mourinho saw his side draw 0-0 with West Ham on Wednesday, City moved top of the table thanks to a 5-1 victory over Tottenham at White Hart Lane.
Manuel Pellegrini's free-scoring side are now a point ahead of Arsenal and three clear of third-placed Chelsea.
Ahead of Chelsea's visit to City, Mourinho said: "Are they favourites? Yes. Are they even favourites to score again four, five, six goals? Yes.
"But the result is 0-0 and we go there to compete and to play."
He continued: "For how long have I said the same thing? For how many months?
"For me it is not a surprise but we go there next Monday and the result at this moment is 0-0."
Mourinho's men came out on top against City earlier this season - winning 2-1 at Stamford Bridge in October.
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