If they gel that is. Could take the best 4 defenders on paper in the world but if they have no understanding of each others game we'd still struggle.
As mentioned, Toure and Lescott seem to be heavily linked. Then there is Luisao from Benifca, Maicon, Chretien the Moroccan full back, Turner at Hull, Hangeland at Fulham, Samba from Blackburn... We're linked with quite a few tbh, but the reality is that it will be one or two at most who come in I think.