Guardiola concedes he faces a fresh challenge as he enters the final year of his current contract.
He explained, "This is a great challenge for me, I have never coached the same team for five years.
"The biggest challenge is to keep the same level as in previous seasons. In a world where everybody fires everybody, it's really hard for a manager to stay that long.
"Once England was an exception but now it's no longer, it all depends on the results. I'm proud of my staff and my players, they helped me a lot to reach this goal."