Chasing a two goal deficit means Arsenal will have the freedom to potentially cause an upset against Barcelona on Wednesday, according to Laurent Koscielny.

"We don't have pressure like in the first game, because we play against the best team in the world," he told the club website.

"Now we need to play the second leg away at Barca and we have nothing to lose. People always talk about the statistics and I think we have maybe a five per cent chance to qualify.

"You know when you play against the best players in the world, the best team with a good collective side, it's very important for us. It can be very important if we can have a [good] result.

"We need to play with freedom and believe in our quality because we did well during the first six months of this season. I don't see why we can't [play like that] against Barcelona and for the rest of the season.

"You know we are in a difficult period and we need to stay like a unit to be stronger. We will fight until the end of the season."