Arsenal boss Arsene Wenger described his side's performance in the 4-0 loss at Liverpool as "not acceptable" and admitted they had been an "easy opponent" for the Reds.
Asked afterwards about what had gone wrong for his side, Wenger - who opted to drop record signing Alexandre Lacazette to the bench and saw Alexis Sanchez fail to sparkle on his return to the team - said: "Everything.
"I think from the first to the last minute we were not at the level requested for such a game - not physically, not technically, not mentally were we at the level, and we were punished.
"That's basically it. You can analyse the chances we gave away. But I just think overall the performance was not at the requested level."
The Gunners are now odds-on at 4/9 with Sky Bet to finish outside the top four in the Premier League and Wenger is 16/1 to be the next top-flight manager to leave his job.
Arsenal's previous two Premier League matches this season had seen them beat Leicester 4-3 at home, then lose 1-0 at Stoke.
Wenger added: "I believe in our first two games we looked quite good - our performances were good.
"But today the performance was not acceptable at that level. It is true that today we were an easy opponent for Liverpool."
When asked why the performance had been so sub-standard, the Frenchman said: "That is a question that is very difficult to answer straight away after the game.
"There are some reasons, but I don't think I have too much to comment on that now."