I had been skeptical about us going after Stones AND Laporte but now... Looking at how Pep had us passing of defence was impressive, but I can see us needing a big turnover in players to get in people who can play this way without it being quite risky (Lots of misplaced passes yesterday and lucky not to get punished).
If I look over our squad, defenders/goalies are either technically decent but getting a bit long in the tooth (Kompany, Sagna, Clichy, Caballero, Zab), with technical question marks (Hart, Otamendi, Mangala, Kolarov) or unproven (Maffeo, Angelino, Tosin, Denayer, Gunn). Not one player I could pen into the team sheet for the next 3-5 years with real confidence.
I'm sure some of those unproven players will establish themselves, but I can see having a major turnover of defensive players over the next 12 months.