The perfect compliment to Vidic is Rio Ferdinand, what happened to him? What season are you in? Because by the time Ferdinand has become too old to play every game, you should have Evans, Jones and Smalling all ready to step on to partner Vidic. And by the time Vidic gets too old, those 3 can compete for the 2 cb positions. Despite what might be made of it in real life, in the game the United central defence is solid, and you should only have to buy a cb when Vidic retires so you still have 4 good cbs.