Keita should stay, he provdes a more defensive midfield option compared to Iniesta, Xavi, Cesc and Thiago.
Next season Alexis, Cesc, Thiago, Cuenca and Tello should all improve. Mascherano will have another years experience of CB and so should do even better next season. Montoya will hopefully provide Alves with more rotation and thus improve his performance. Pedro hopefully gets back to something like his best. Villa doesn't have an injury.
Hopefully we start the season with fit CBs.
Next season Alexis, Cesc, Thiago, Cuenca and Tello should all improve. Mascherano will have another years experience of CB and so should do even better next season. Montoya will hopefully provide Alves with more rotation and thus improve his performance. Pedro hopefully gets back to something like his best. Villa doesn't have an injury.
Hopefully we start the season with fit CBs.