Vidic said: "When you have more responsibility you seem to have more concentration and that only helps to improve your performances.
"I have become a better player now I am captain.
"In general, when players have more pressure and responsibility, it becomes a positive thing. I am playing harder than before, training hard and showing more concentration. I am playing the best I can.
"Becoming captain of Manchester United was one of the proudest moments of my career, but we have a lot of leaders here who have also been captains.
"I am at the right age to accept responsibility and I am one of the most experienced players at the club.
"And maybe another reason I have the armband is because we have had problems in the past when the captain has been injured. I am usually always on the pitch."