Vidic is out for the season with a knee injury.
"We didn't expect the young players would play so many games and have such influence on the team," said Vidic.
"This is a great plus for the club.
"Obviously we have had some injuries over the past year, which is another difficult thing we have gone through, but we have coped and been very competitive with Manchester City.
"Now we are at the top of the league and have a big chance to win it."