I have been currently using 4-2-2-2 as my main formation
GK- De Gea/Lindergaard
RB- Rafael/Santon/Jones- Full Back
RCB- Jones/Ferdinand/Smalling- Central Defender
LCB- Vidic/Evans- Central Defender
LB- Santon/Evra- Full Back
RCM- Fellaini/Pogba- Deep Lying Playmaker
LCM- Carrick/Cleverley/Fletcher- Central Midfielder
RAM- Valencia/Nani/Young- Winger
LAM- Mata/Kagawa- Advanced Playmaker
LS- Van Persie/Hernandez- Poacher
RS- Rooney/Welbeck- Deep Lying Forward