After last seasons problems at the back, Pep Guardiola let go Pablo Zabaleta, Bacary Sagna, Gael Clichy and Aleksandar Kolarov and also let Jason Denayer go out on loan back to Galatasaray.
The outgoing backline was replaced with Danilo, Kyle Walker and Benjamin Mendy with Eliaquim Mangala also coming back from his loan spell with Valencia.
Mangala came close to joining West Brom on deadline day in the summer and ever since then City have been linked with various players for his position.
With the Frenchman still being linked with a move away from the Etihad Stadium and with John Stones’ and Vincent Kompany’s injury problems, Pep could dip into the market to sign a centre back.
Here are five centre-backs that Pep should target to make his defence stronger in the January transfer window: