The right-back has hit out at those who claim the move was all about money.
Sagna will join the Premier League Champions after seven years with Arsenal and although City's wealth is well documented, he insisted that wasn't the main factor in swapping the Emirates Stadium for the Etihad.
He's quoted in the Manchester Evening News, saying: "I stayed with Arsenal with the same contract since 2008 and I never asked for more money.
"For people who think it's for money, it's not. I just wanted to change. I needed a boost in my career and I think it was about time.
"It's just that, personally, I wanted a boost. I needed to start from the bottom again. It is an exciting time for my career because I'm 31.
"I know they have a very good right-back in Zabaleta and I will have to fight to find some time on the pitch but I think we have a good team with City and we can do great."
Zabaleta has been in terrific form for Manchester City over the past few seasons and Sagna will have his work cut out getting ahead of the Argentine full-back in the pecking order. But if last season is anything to go by - judging by Manuel Pellegrini's use of left-backs, if he decides to operate his right-backs in the same way next season, the chances are the Frenchman could get plenty of game time.
Another reason aside from money for Sagna's move could be footballing reasons. Maybe the term 'boost in his career' meant he feels he has more chance of possibly winning the Premier League title and Champions League with Manchester City rather than Arsenal. If that was the case Gunners fans would argue that they didn't finish that far behind City last season (seven points) despite finishing fourth, and aren't far away from becoming a side capable of winning those two big honours.