The 48-year-old Spaniard was appointed in 2016 and signed a contract extension last year until 2021.
No talks have yet been held with City chiefs, but Guardiola said: "I'm so comfortable working with this club.
"When you are [somewhere for] five years it depends on the results. We will see what happens this season and next season.
"I'm open [to it], yes. It is not about what the club wants or not. For me, I want to see my players and the reaction of my players and everything.
"It is not as simple as I want to extend. I want to see the club, I want to see the players, I want to see how we are still working together.
"That is the most important thing after five years together. You have to feel like we can do it together and enjoy to work together."