City face RB Leipzig in their first Champions League group stage game in midweek, but many fans are already looking forward to their two group ties against Paris Saint-Germain later in the season.
"Absolutely, the most difficult game we have will be the first against Leipzig, this is the most important game," Guardiola said.
"I don't think one second about PSG. The teams we are going to face in the group are so, so difficult.
"Leipzig have grown up in Germany, Bayern have been unstoppable but to be there all the time second, third, second, third, fighting with Dortmund with the quality they have, it will be a good test.
"It's important to arrive in this test the way we played on Saturday."
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