The Sky Blues manager saw his side win the league before losing out in the Champion's League final to Chelsea.
But the Spaniard suggests anyone describing last season as anything other than a complete success is wrong.
.He said: "People can say Man City was a failure but it was an incredible achievement last season, playing really well in many of the games and losing well against a big contender.
"Every time I start this competition with drive.
"I'm incredibly happy here.
"Man City made a step forward last season, we improved a lot.
"We had 13 games and we won 11.
"We played incredibly well in Porto [in the group stage] when we drew and deserved to win.
"We lost the final.
"Now we start a new one and every team wants to win.
"We're going to try but I won't tell you which team is going to win because I don't know it."
Manchester City kick off this season's campaign with a home tie against against RB Leipzig tomorrow night and Guardiola- who has spent almost £1billion during his time at the club- is aware of the pressure to win the Champions League.
He said: "I accept it.
"Every year is the same.
"If I win the Champions League I will be happy for the club.
"If I'm not able to do it, I'm not able.
"After, you can judge the success of my period."