United had surrendered a two-goal lead at Manchester City on Sunday, but Fergie refused to bring on a defensive player and settle for a point.
And Vidic said: "The boss loves three points. A draw is the same as losing to him, that's the mentality he has. He is a winner and that's why he is manager of United. The way he approaches the game is the reason he has so many titles because he's always going for the win.
"It's a signal to us. Sometimes you cannot rely on the players to have a winning mentality, you have to show them and this is the way to do that.
"He shows us with things like his changes - 'I want to win, I want three points'. Sometimes it's not what you say, it's what you do that helps create the winning mentality."