Arsene Wenger acknowledged his Arsenal team “collapsed” away to Bayern Munich as they suffered a second 5-1 Champions League defeat in successive seasons at Allianz Arena.

The Gunners came from 1-0 down to go into the break level at 1-1 away to the Bundesliga champions, Arjen Robben opening the scoring and Alexis Sanchez responding for the visitors in the first leg of the round-of-16 tie.

The loss of captain and centre-back Laurent Koscielny to injury early in the second half appeared to prove fatal, though, and acted as the trigger for a disastrous spell which saw Thiago Alcantara score twice and both Robert Lewandowski and substitute Thomas Muller hit the back of the net.

Speaking to BT Sport, a downcast Wenger struggled to assess the scale of his team’s demise.

“It’s difficult to explain,” he said.

“I felt that just before half-time we played well. We were unlucky on the second goal.

“We lost Koscielny very quickly in the second half, he came off at 1-1. And suddenly it looked like we collapsed. It’s difficult mentally. [Bayern] were a better team than us as well. They played very well in the second half.”

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