Boateng, Nastacic, Savic, Mangala and until this season Stone and Otamendi. We have a poor track record when purchasing CBs. Not necessarily because they are bad players but they just didn't fit in. So spending another 30m on an average PL defender worries me.Yep I don't agree with the signing but if he is more reliable than Mangala and helps City win the league then fair enough.