City lost 2-0 at the Etihad Stadium last month meaning they need at least two goals at the Campo Nou on Wednesday but that target is something that the skipper is not shying away from.
Kompany led the Eastlands club to the Premier League title in 2012 when they produced a stunning comeback by scoring twice in injury-time against QPR and the Belgian is hoping to revisit that in Spain tomorrow night.
"Football is made out of nights like this," said Kompany at the pre-game press conference.
"If anything should give you belief, then it should be that day against QPR. We're here to try and have one of those special nights.
"It's in our own hands and that's the good thing, so I guess the message to everyone is that we have to believe.
"I'm actually very excited about this one and I think the whole team is.
"If everything goes well, we're capable of hurting Barcelona, so that's what I want to focus on.
"I like to focus on my strikers because I know that, if they score, we have a chance, but everyone needs to be at their best.
"I would say we have a chance to come here and we don't have anything to lose.
"It is all about that first goal. If we get the lead, then I believe the dynamics of the game will change.
"I am convinced of that but, obviously, it is one of the toughest places in the world to come and try to achieve something like this."
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