City disposed of Borussia Monchengladbach 4-0 at the Etihad Stadium on Wednesday night, prompting Guardiola to suggest this is where the club truly belongs and asking the fans to get on board after a crowd of just over 30,000 turned up.
"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."
The reduced crowd size was impacted by the fact the match had been rescheduled from Tuesday night after torrential rain affected the playing surface and surrounding areas at the Etihad.