The Gunners will have to overturn a two-goal deficit at Camp Nou if they are to progress to the quarter-finals of the tournament for the first time in six seasons
Arsenal full-back Hector Bellerin bemoaned missed opportunities in the 2-0 Champions League loss at home to Barcelona but insisted the team remain upbeat about their chances of qualifying for the last-eight.
The north Londoners came unstuck against Barca in the opening leg of the European last-16 tie on Tuesday, with Lionel Messi's second-half brace putting the title holders in the box seat.
Alex Oxlade-Chamberlain and Olivier Giroud had opportunities to score for Arsenal - though neither found the back of the net - leaving the Premier League side with a mountain to climb heading to Camp Nou next month.
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Speaking after the defeat, Bellerin told reporters: "We have had several chances to score first. It is hard against a time like this one and when you do not score, if they have chances, they can score. The first one was in a counter-attack and the second one in a penalty.
"We have the heads up. We will face the second-leg as we did with this first-leg. We are a side that play good and we still have a chance. It is something very difficult, but we never give up.
"We have been a compact side. But were not as lucky as they were. We know we need to be more lethal."
Bellerin - a Barca youth academy product who swapped the Catalans for Arsenal in 2011 - added: "Facing Barcelona was very special to me. That is where I was grown up.
"But I defend another shirt now and I am so proud of representing Arsenal."