Pep Guardiola says it was crucial for Manchester City to get their Champions League underway with a win following their 4-0 hammering of Borussia Monchengladbach on Wednesday night.
Sergio Aguero was the key man for City as he scored a hat-trick before being replaced by the final goalscorer Kelechi Iheanacho.
It was a commanding display from City, who have now won all seven of their games under Guardiola this season.
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Speaking after the match, the delighted manager told the club's official website: "I'm really happy. I'm so happy. I knew how difficult and important this game was. If we didn't get points in the first game at home against Gladbach, it would make games against Barcelona and Celtic more difficult.
"Today was the most important game in the season. Considering the opponent and the pressure, we played really, really good – the players played at a high level."
He added: "I know perfectly Borussia. The coach always created a lot of problems for us when I was at Bayern. We dominated and we were so aggressive with and without the ball. It was difficult for them to control our build-up because of our movement between each other.
"It's a good moment to enjoy our football with our fans. That is our future in the Champions League.
"The fans have to know we play for them. It's our job. We need them in the Champions League to beat the best teams in the world. We cannot make something good in the Champions League in the coming years without them.
"With this spirit and the way we've played in these games, I am confident I am going to enjoy this year."