The former Porto man has failed to establish himself as a first choice centre-back in his time at the Etihad.
The 25-year-old Frenchman arrived at the Etihad in 2014 for a fee believed to be around £32 million, and has since failed to live up to the high levels of performance expected of him.
Speaking to Sky Sports, Mangala accepts his performances have not been good enough, but insists that he will get better:
"I know I can do better. This is not my best. The most important thing for me is consistency. To have a good game and then maintain consistency."
Mangala's displays have shown signs of improvement recently, however, contributing to clean-sheets against Paris Saint-Germain and Chelsea, and he spoke of his desire to constantly improve:
"My objective has been to prove myself, to prove that I can do something good. Every single training session and every game I try to improve the way I defend."
The Citizens currently sit in third place in the Premier League, after experiencing inconsistent spells earlier on in the campaign, but have shown signs of getting back to their best of late. They travel to Southampton tomorrow in a game where the outcome could go a long way towards deciding which European competition Pep Guardiola will have to tackle in his first season at the Etihad.