The Blues ended Manchester City's 100% home record under Manuel Pellegrini with a 1-0 victory at the Etihad Stadium on Monday, but Mourinho immediately dismissed their chances of winning the Premier League.
"Because we love the big games, that why we do well in them," the Chelsea manager told reporters at a post-match press conference. "When you love the big games, you feel extra motivated for them.
"I keep saying the evolution of this team is not to play the Europa League and be 20 points behind in the Premier League, but to play the the big games like this with pressure. And we showed aesthetically mentally we were fantastic.
"But I don't agree we can win the league. You can see we lost points at home to West Brom and West Ham, we lost at Stoke and Newcastle, we are a team in evolution. But this is the kind of performance that helps the team to grow up a lot."
The result moved Chelsea level on points with City in the table, but they still trail leaders Arsenal by two points.