The Gunners suffered a stunning 3-2 loss at the Emirates earlier this evening thanks to a 65th minute strike from Alfred Finnbogason.

Prior to kick-off, Wenger branded the visit of the Greeks, who suffered a 3-0 defeat to Bayern Munich in their last European outing, as a 'must-win game'.

The Frenchman, 65, was not pleased with the performance of his team and believes his men were punished because they failed to concentrate at key moments.

"It is still possible of course to qualify but it is difficult to swallow losing a game like that," Wenger said.

DISAPPOINTED: Wenger reacts

"We lost it on a lack of defensive concentration and bad luck.

"They had four shots on goal and we conceded three goals.

DEJECTED: Wenger's men look on

"The turning point at 2-2 is we give them a goal again straight away. If it stays 2-2 for five minutes we win the game.

"A goalkeeper can make a mistake that doesn't explain that we lose the game. It happened to Petr Cech already this season [against West Ham]."