Pep Guardiola wants another centre-back during this summer transfer window, despite already landing Nathan Ake from Bournemouth for £40million.Kalidou Koulibaly is the principal City target, though it's claimed Gimenez is a credible alternative to the Napoli centre-back, with Chelsea also linked with the Uruguayan defender, 25.Italian news outlet La Gazzetta dello Sport report that Atletico have knocked back City's approach for Gimenez, with Diego Simeone keen to keep his star players at Wanda