The Premier League leaders have conceded 31 goals so far this season – more than any other team currently in the top six of the table.
And Vidic, who is braced for a testing encounter when Sir Alex Ferguson’s men travel to the Bernabéu next Wednesday, believes that the key to booking a quarter-final spot is to keep it tight at the back in the first leg.
“We’re going to have to play as a team there,” Vidic told FourFourTwo. “We need to get it right defensively and not concede many goals in the first leg.
“You have to be solid as a team, not just at the back but all over the pitch. You have to have quality.
“We have a big squad and young players coming through with experience from playing games last year, which is a big help to the team.
“A lot of our players have matured now. There is a long way to go, but we will see.”
MORE: Latest Man Utd news
MORE: Latest Arsenal news
MORE: The latest football news