Arsenal must overturn a 1-0 deficit from Old Trafford to progress to the final in Rome on May 27, but the Gunners boss thinks his team can do it in style.
The Gunners boss said: 'I believe we will make it. We have a good opportunity to enjoy it, we have a good opportunity to play the football we love.
Positive: Arsene Wenger is convinced his side can deliver the goods tonight
'No matter what happens I believe this team will make a big impact in the game and that is what we want to continue to develop.
'When we've beaten them at home in the Premier League there havebeen plenty of opportunities, and I don't think that would change mybelief at all if they score.'
Wenger also praised his young team's improvement over the course of the campaign.
At Christmas Arsenal were in danger of missing out on a ChampionsLeague spot to Aston Villa, but a 21-game unbeaten run in the topflight has got their season back on track.
They are now 10 points clear of Villa in fourth place with three games left.
The Gunners also reached the semi-final of the FA Cup, losing 2-1 to Chelsea at Wembley.
Wenger said: 'The progress this team have made since the start ofthe season has been remarkable. There's no mission impossible for us.'
Arsenal striker Emmanuel Adebayor risks the wrath of Arsenal won't be gunning for United striker Rooney, claims club legend Winterburn ARSENAL FC