Khedira on a free would be amazing. I cant believe we havent even looked, or Alex Song would cost peanuts. More than enough quality there for a player to sit infront of the back 4. Which would allow Carrick/Herrera to rotate and also Di Maria/Fellaini to rotate for our Midfield 3. So lets say Herrera - Khedira - Di Maria, or Carrick, Song, Fellaini. Blind can cover left back with Shaw. Depay/Young on the left. The right needs sorting completely. Cant rely on Mata as a winger but hasnt done so bad there with Herrera in support. Rooney behind a top quality striker that knows where the net is.
GK - Begovic/Valdes (if De Gea goes)
RB - Alves/Valencia
CB - Smalling/Jones
CB - Otamendi/Rojo
LB - Shaw/Blind
CDM - Khedira/Song
CM - Herrera/Carrick
CM - Di Maria/Fellaini
RW - Mata/Nani/New signing
AMC - Rooney/Mata/Di Maria
LW - Depay/Young
ST - Higuain (or other)/Rooney
6 players MAX, and 3 would cost either nothing or peanuts. Id be more than happy with that and would sort the team right out. Also plenty of players can play more than one position so allows for greater rotation.