how do you guys think vidic's future at manchester united with his long-term injury?

well, some players dont recover from that sort of injury, and some do. in my opinion i think vidic will recover and get back to his best (hopefully) but i also heard that sir Alex will be willing to sell him next summer, as real madrid are looking at him. i think he is about 30 years old, so i guess if we were to sell him, then now atleast we could get money for him. 

what would the money for?