The Frenchman also admits that the whole side know they could have done better last season.
City were joint-top with Jose Mourinho’s side at the beginning of 2015 having done well to drag themselves back into the race after the Blues had opened up a commanding lead on their rivals.
However, they then struggled throughout the new year as a run of just 21 points from a possible 42 saw them fall away, although they did manage to finish second and secure Champions League football with a fine end-of-season run.
And Nasri believes they will need to improve their home form next season, as for him, that is where they fell well short last year.
“We lost the title at home, for me, and that was a key factor when Chelsea were really consistent,” he said.
"Look at our record against the teams that ended up being relegated, too; we lost five points against Burnley, we lost two points against QPR and two points against Hull. It’s something that we have to correct if we want to win the trophy."
Not only were City once again disappointing in their title defence, as they were under Roberto Mancini previously, the side were also dumped out of the Capital One Cup and FA Cup early on as well.
Their Champions League adventure followed a similar theme, with them once again being knocked out by Barcelona, and Nasri insists the whole side knows they could have done better.
“When you play for a team like City you expect to win a trophy every year,” he added.
“We are proud and we are not happy about last season. We were all disappointed because we know our quality and we know we could have done better.”