The victory marked the 1,000 game in management for Guardiola.
Dias said at the final whistle: "Obviously very happy for him (Pep Guardiola). We live for games like this. There is no higher level than this kind of level.
"Everyone did a great game.
"We need to push all of us. Everyone, myself, we need to push everyone. The amazing game he (Jeremy Doku) did, the sprint Haaland did to compensate.
"I remember before I came to this club and watching this club - these were the details that made them win so much.
"Differences of everyone ready to show up and ready to sacrifice for the guy next to him.
"This is not new, this has been going on for a while now. We have been talking about a rebuild since last season.
"Yes, of course, there are new faces because of the ones that left, but that quality stays the same, and we keep on pushing.
"It is still early in the season, feet on the ground."