Arsene Wenger has conceded that Arsenal's defensive performance in their 5-1 defeat to Bayern München on Wednesday was simply not good enough.
The Gunners are on the brink of an early exit from the Champions League after suffering their third defeat from five matches in Group F, a result which leaves them bottom of the standings and needing to win their last two matches and hope other results go their way if they are to progress to the knockout stages.
With Laurent Koscielny only fit enough to be named among the replacements due to a hip injury, Gabriel and Per Mertesacker lined-up in the centre of defence for the Gunners and the pair were given a torrid time by Bayern.
Speaking after the match, Wenger admitted that his side's showing was not up to standard.
"Defensively we were extremely poor. We never looked like a team that could play like a unit," said Wenger.
"The crazy thing is we looked like we could create chances but overall we had a disappointing performance.
"There was no pressing, no concentration, no challenges. We watched them play. They are a good side and we paid for it."
Arsenal can still qualify for the knockout rounds, but they will need to beat Dinamo Zagreb and Olympiakos in their last two matches and hope that the Greek side loses to Bayern.
Wenger remains hopeful that his side can turn their fortunes around but has said they will not be able to do so if they put in similar showings to the one they delivered in Munich.
"There is still a chance to qualify," said Wenger. "We have to realise that our chance is at a minimum."
"It leaves us short," he added. "It will be very tight but we have to fight until the end. Let's hope Bayern beat Olympiakos and we win at home against Zagreb. That leaves us with a chance to qualify from the last game.
"It's a small chance but there is still a real one."
Next on the agenda for Arsenal is a north London derby against Tottenham on Sunday.