The Gunners held off Barca's superb attack well for the majority of the UEFA Champions League last-16 first leg, but Lionel Messi eventually dealt the killer blows with two goals in the last 20 minutes, one of which was a penalty.
Lionel Messi struck a brace as Barcelona's late show saw them secure a 2-0 victory at Arsenal and take a commanding grip of this Champions League last-16 tie.
"We will go to Manchester United and we are in a good position - we don't want to give that up".
Arsenal relied on counter-attacks and had chances, most notably from Alex Oxlade-Chamberlain and Olivier Giroud, but now have a daunting task to turn the tie around in the Nou Camp. "I'm delighted with the way we played throughout the game".
Okay we all know Man United have won their last two games scoring 8 goals, but come on, you can hardly consider that wonderful form when your opponents were Shrewsbury and a team I can't even spell, can you?
"Arsenal did very well in the first half, with some help, but we knew they wouldn't be able to keep that pace up all the way".
"I thought we did really well until the first goal".
Per Mertesacker insists Arsenal will not feel sorry for themselves after their humbling defeat to Barcelona - and believes there is still a small chance they can advance in the Champions League.
He said: "We were naive".
"Let's remember that Arsenal lost to a team trying to win back-to-back Champions League trophies, and who would bet against them?"
"It is a hard deficit to overcome but 2-0 is not 5-0 and we have 90 minutes with a chance", he said.
Arsenal played an impressive game against Barcelona in the 1st game between them in the round of 16 at the Emirates stadium. "All of them (Barca players), not one goes down without shouting".
"Barcelona is a great team".
"It was a pity".
"But at this moment in time, what he needs is the support of all the supporters because they have a huge 12 games coming up in the league and they are still in the FA Cup".