The 31-year-old France international right back completes his long-awaited free transfer to the Premier League champion after saying goodbye to Arsenal on Thursday.
|MAN CITY LATEST
The France international right back joins the Premier League champion on a three-year contract after confirming on Thursday that he would not renew his deal at the Emirates Stadium.
The defender's future at the Gunners had been in doubt for a long time. Talks over a potential renewal began again in earnest in January but an agreement was not quickly forthcoming.
By the start of May, Arsenal feared that Sagna would jump ship to join a Premier League rival at the end of his deal, a concern that grew more real when the 31-year-old told the club that he would not stay beyond the summer.
Sagna joined the likes of Porto midfielder Fernando as City manager Manuel Pellegrini's top targets in the close season and he opened formal negotiations with his soon-to-be-new side on May 19.
It leaves Arsene Wenger needing a new option at right back, with Atletico Madrid's Juanfran and Toulouse star Serge Aurier chief among his considerations for the Frenchman's replacement.