Give me defenders who i can buy...and a world class keeper to knock Joe Hart off his number 1 spot
Well as for the Joe Hart situation, start playing Stegen more often, and it'll create competition for that first team spot. Most games you start with Hart, so there is a possibility he is feeling complacent. If you did want to buy another keeper then you can buy Igor Akinfeev, or if you really wanted to splash out, then you could try sign Neuer or Lloris.
As for defenders, i would suggest Hummels and Thiago Silva, who could become your equivalent of Ferdinand and Vidic. Corchia and Digne are good, but not world class (yet). I would suggest Vrsaljko for RB, or Romario. And for LB, if he isnt too old, try Lahm or play Coentrao as a permanent LB. Just train his defensive stats to be better.
Hope that helps mate