The 31-year-old centre-back has made just 14 starts since December 2011 after suffering the serious ligament damage against Basel in the Champions League.
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Vidic told BBC Radio Manchester: "With playing Wednesday and Saturday, some games I have to think if it's good for myself to play or not.
"After every game I feel better and better, which is a good sign. Sometimes I will get reactions, sometimes not.
"When I have got through two or three months without injuries, I will be fine. It's not long-term. It's normal procedure after this kind of operation.
"We have to manage the knee for the next two or three months and after that it's going to be normal."