United have not recorded an away win against the team they defeated in the 2008 final in Moscow for nine years and most recently came unstuck in the Premier League just five weeks ago.

It is a formidable record Sir Alex Ferguson's team could do with ending if they are to harbour realistic hopes of making the last four.

Vidic feels they can do it and a crucial away goal will dispel any doubts.

However, the United skipper feels that as kick-off time approaches, the hosts will be the ones who will have the extra belief.

"In terms of the results, yes, they do have an edge because they had good ones against us," said the Serbian.

"But this is the Champions League and the name of the game for is on Wednesday is to score an away goal."

To that end, United's own morale is sky high after another of those astounding comebacks at West Ham on Saturday.

Although Ferguson will not adopt the same gung-ho tactics he employed during the second half at Upton Park this week, that four-goal blitz that sent United seven points clear at the top of the Premier League is a reminder of the firepower at their disposal.

"Our performance on Saturday is a big positive for us," he said.

"We scored four goals and played very good football. We do need to improve the defending part but if we can play like that against Chelsea, I am sure we will be okay."

Vidic's previous weakness against Fernando Torres seems to have been forgotten as Chelsea's £50million front-man waits for his first Blues goal.

Given the torment he has endured against the Spain star, Vidic could be forgiven for having a little smirk to himself.

He is refusing though, insisting Chelsea's striking concerns are not something United should take any encouragement from.

"It doesn't give us any confidence," he said.

"Chelsea have good strikers, and we have a lot of respect for them.

"Just because they haven't been scoring goals, they will still be doing their best. And in a cup tie, what matters is who wins, not who gets the goals."

Vidic could have been going into the game on the back of a red card following his clumsy challenge on Demba Ba at the weekend, which turned out to be the pivotal moment of the contest.

Already two goals down, if the defender had gone off, it is hard to envisage United being able to turn the match around in the manner that they did.

Instead, referee Lee Mason took a lenient view, believing the ball was running through to goalkeeper Tomasz Kuszczak, therefore Vidic was not denying the Hammers forward a goalscoring opportunity.

"When I saw he gave the foul to West Ham, I was worried he would maybe give me a card, but I didn't know which one it would be," said Vidic.

"Sometimes referees are right, on other occasions they are wrong.

"I try not to let it disturb me either way."