City are likely to be the most significant threat to Liverpool next term.
Guardiola said: "Hopefully we can learn from our beginning to the season.
"After winning the Community Shield against Liverpool, we dropped points maybe we didn't expect. But I don't know if it's going to happen.
"We saw in the last period how Man United made a step forward.
"Tottenham are going to recover a lot of injured players, with Son, Harry Kane and other players and with an experienced manager like [Jose] Mourinho they are always going to be strong.
"Arsenal with more time with Mikel [Arteta] is going to happen - and Leicester you know.
"Every season the teams are stronger and stronger and it will be more difficult."