The French centre-back acknowledged it's taken time for him to adapt to the Premier League.
Speaking with sports newspaper A Bola, the 24-year-old has admitted that after playing in Portugal, getting used to life in the Premier League has been far from easy, given how much stronger the level of competition is in England.
He acknowledged: "It was difficult for me, and it's taken time for me to adapt." Aware that his performances haven't been as consistent, as he would have liked.
However, the French central defender has assured the Manchester City faithful, he now feels more settled in, promising them that they can expect much better performances from his second season at the club.
He explained: "Now I know the Premier League much better, and I feel much better prepared to play this kind of football. I'm really confident ahead of next season."
Mangala has made 28 appearances in all competitions this season, but concerns over his level of performance, perhaps mirrors that of the whole squad, with Manchester City expected to achieve much more from the 2014-15 campaign.