Arsene Wenger described his side's 4-0 thrashing at AC Milan in the Champions League as Arsenal's "worst night in Europe" as they face elimination in the first knockout round.
Wenger admitted that Arsenal face little chance of becoming the first team to overturn such a first leg deficit in the return leg at Emirates Stadium in three weeks' time.
The Gunners put in an abject display at the San Siro, unable to handle the fast-paced style of Milan while it was Arsenal themselves who dropped into the Serie A stereotype of a languid, stuttering playing style.
"It was a shocking result and a shocking performance," said the Arsenal boss. "It was of those nights you never forget. It is our worst night in Europe. We were punished and deservedly so.
"The result is a disaster. Were never in the game we were very poor offensive and defensively. There was not one moment in the 90 minutes we were really in the game, and it was always the same problem, balls over the top and we were well beaten.
"It is difficult to analyse, so it is better not to talk too much, to analyse with a cooler header and regroup for the next game.
"The season is not finished. We have a big game on Saturday [at Sunderland, FA Cup] and it is a good opportunity to show we have character and mental strength, that we can respond after such a shocking defeat. You could blame and blame, but we have to stick together and win the next game.
"A big disappointment like that has consequences on your belief. We have a lot of work to regroup and not a lot of time to prepare for Saturday's game, when we need to show something completely different.
"We don't play in dream world. There is maybe a 2% or 5% (chance) statistically. We have to show a completely different performance and you never know, but, you have to say, realistically, we are out of the competition.''