Arsenal manager Arsene Wenger has blamed his team home loss to Barcelona on Tuesday to poor finishing and naivety.
"The way we finished our chances is a problem. I felt in the final third we missed something," said Wenger.
"They are lethal. One thing we couldn't afford to give them was counter attacks because they are very dangerous. That's exactly what we did. We pushed too far in their half and got caught. That's down to their quality as well.
"Barcelona are through 95% but we want to go there and play. We will not go there and have absolutely no chance," he added.