Nemanja Vidic believes that Manchester United need to improve defensively if they are to progress to the final of the UEFA Champions League in Rome.
Arsenal currently stand in their way with the two teams set to clash at Old Trafford in the semi-final first-leg on Wednesday.
Strangely, after their record breaking defensive run earlier in the season, the Red Devils' backline has been uncharacteristically leaky over the past month.
After conceding 11 goals in five matches United had appeared to have turned the corner with three consecutive clean sheets but after the defensive frailties that were on show in Saturday's 5-2 win over Tottenham, Vidic is looking for improvement.
"In the first half (against Spurs) we didn't defend very well," the Serbian international said.
"In the second half we came back much stronger, and that is how we need to play against Arsenal and any team we play against.
"It just happens - sometimes things just go wrong.
"We will try to fix the problems we have had in the last games, but we need to remember as well that we have changed many players.
"We have not played with a consistent team at the back, even in the middle or up front.
"We have so many games that sometimes you have to change the team and sometimes you need time to adapt."
The 27-year-old knows the importance of taking a clean sheet to the Emirates for the second-leg but also adds that United have more than enough fire power to outscore the Gunners.
"We have the first game at home so we need to do well, we need to score goals, we especially have to improve on what has not been good in the last few games," he highlighted.
"To not concede a goal is very important, but we have players who can score, players who believe in themselves."
However Arsenal have there own fair share of attacking prowess at their disposal and Vidic admits that he will have to keep Arsenal striker Emmanuel Adebayor quiet.
"He's a great player and has the ability to score," the former Spartak Moscow man added.
"He is a big and strong and in that respect you have to expect a hard game against such an opponent."