Petr Cech said Arsenal's lack of fight against Liverpool was "quite simply unacceptable," but insisted they could still compete for the Premier League title.
Arsenal were demolished 4-0 at Anfield after a lacklustre performance saw them dominated by Liverpool throughout, failing to muster a shot on target.
The Gunners could not cope with Liverpool's energy and were repeatedly beaten in duels and challenges, which Cech said was the most disappointing aspect of their display.
"It was quite simply unacceptable for the size of the club we are and for the team we have," the goalkeeper told Sky Sports.
"Obviously you can come here and lose 4-0. OK, it can happen on a bad day when you fight but you are unlucky and your opponent is playing well and scores with every shot they have. Then it can happen.
"But not like it happened today. The way it happened today is unacceptable.
"We were not fighting, we were not running enough, we were not winning any individual battles and as a team we completely failed to respond to their way of playing, and that is the most disappointing thing.
"But we have only ourselves to blame."
The loss leaves Arsenal in 16th place in the Premier League table with three points from three games, having also lost at Stoke last weekend.
But while many fans and critics are already writing off their title chances, Cech said: "I would say the only positive out of the game is that we have to respond, and we have time to respond.
"It's very early doors in the season, and with two defeats you can still win the league.
"If I didn't believe that we could do that I would probably retire and not play football any more. But I believe that this team has everything to compete and to win the title.
"I think we have shown that in many games and we need to make sure we are consistent and that, when the games come, we are always on top."