Arsenal boss Arsene Wenger admits he was impressed by Barcelona's first-half performance in last week's 2-2 draw.

Barcelona didn't break the deadlock until the 46th minute, but Wenger couldn't help but appreciate what he was seeing.

However, the manager's over-riding emotion was fear.

"You admire, of course," he said. "And you worry.

"In the first 20 minutes I have never sat on the bench where my team conceded so many chances. You would think it was like a storm.

"It was difficult because I felt hopefully we can survive."