The United captain initially suffered a serious knee injury against Basel 12 months ago before requiring further surgery in September after making five appearances in the early stages of the season.
He is expected to be involved against Sunderland on Saturday and the centre-half is ready to play his part in United's bid to regain the Premier League title.
"I have worked hard to be the same player again and I have the determination not to drop the quality of my game," Vidic told The Sun.
"There will be pressure. When you play for United you don't have time for people to wait for you.
"When I got the first injury I was out for six months and people were saying 'Is he going to be the same? 'Can he play for United?'
"This is the challenge you have to deal with. But when you have been out for the best part of a year - after having always played - I think I will need to go through a few games to get my form back but I'm confident that I can deal with that.
"Obviously, it's a challenge for me when I come back, firstly to be in the same form as I was but also to help the team.
"As someone who has had six years here and, at 31, with some good years still left to play, I feel a responsibility."
The 31-year-old is also hoping that he does not suffer a further setback following the most difficult 12 months of his United career.
He added: "It is not going to be nice if something happens again. Definitely you can have that in your mind but once you are on the pitch you just play and do not have time for that. I have worked hard with the physios, physically I have been strengthening the legs.
"It is obviously different playing from the start of the season. Now I am coming into December and the rest of my team-mates are on top of their games.
"I am having to come in. But I think I have worked hard and will manage that."
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