Vidic has warned City they don't hand out the trophies in November.
"We will think about what they are going to do," said the defender, "but only if they are five points ahead of us with six games to go.
"You can see what I mean from last year. In the first seven or eight games Chelsea played unbelievably.
"But there was also a time when everything is not going well. It’s a ten-month season and you can’t always play great football.
"There will be good days and bad days but you have to play as a team.
"For that reason, we aren’t thinking about them. We still have to play them and they still have to play the top four or five others as well.
"So, we aren’t thinking about them, because that’s not the way we are going to win the league."