Mikel Arteta said Arsenal must not accept the standards they showed defensively for Chelsea's equaliser in Sunday's 1-1 draw.
Pedro Neto slammed in from distance at Stamford Bridge, 10 minutes after Gabriel Martinelli had put the Gunners ahead.
Arsenal squandered a golden chance late on, when Leandro Trossard nudged wide from William Saliba's cross, leaving Arteta rolling on the touchline in frustration.
But Arteta, who believes Arsenal "dominated" Chelsea despite the Blues registering 17 shots and 1.28 expected goals (xG), singled out the defending for Neto's equaliser as particularly frustrating.
Speaking to Sky Sports, Arteta said: "The disappointment of not getting three points is bigger [than being satisfied] and it will probably be bigger after watching it back.
"I think we dominated them, we were the better team in many phases and situations in the game and after going ahead, very disappointed in the way we conceded.
"It was so poor. It is not [at] our standards and we don't accept [it].
"It is a second phase set piece and we were disorganised. We didn't reorganise quickly enough and you can't allow the pass that way. You need the quality of Neto to do it but our standards were not good enough."
Arsenal have gone four consecutive Premier League games without a win for the first time since April 2023 (D2 L2); the Gunners had picked up all three points in 21 of their previous 25 league matches before this (D3 L1).
This was the fourth time that Arsenal have faced 15+ shots in a Premier League game this season, already twice as many times as they did so across the whole of the 2023-24 campaign (twice).
Arteta was at least buoyed by the return to fitness of Martin Odegaard, who assisted Martinelli on his first appearance since September. Declan Rice, who missed Wednesday's loss to Inter in the Champions League, also played despite injury concerns.
"[He] has been out for six weeks and barely trained with the team," Arteta said of Odegaard, who played the entire match.
"To be able to play at this level in the Premier League tells you how much he looks after himself and the leadership and character he has. Everything flows better with players like this. We clicked much better. You could see everything was flowing but again it is about winning.
"What we have found is that every day we have had to change something big, because we've had problem after problem.
"Normally the team goes down but this team has unbelievable energy and spirit to play."
The draw left Arsenal in fourth, nine points back from Premier League leaders Liverpool heading into the final international break of 2024.
Guardiola believes De Bruyne will be difficult to replace at Man City
Manchester City boss Pep Guardiola knows it will be difficult to find a replacement for midfielder Kevin de Bruyne, should the Belgian depart next year.
The playmaker joined City in 2015 and has played a key role in their trophy-laden spell since then, but he will be out of contract at the end of the season.
De Bruyne's season has been hampered by injury, but the 33-year-old started his first Premier League game since August as City returned to winning ways after seven winless games against Nottingham Forest on Wednesday.
And Guardiola could not stress enough the impact De Bruyne has had on the club.
"I'm not involved in it," the City boss said, when quizzed about contract negotiations with De Bruyne.
"I would like to have him 23 years old and sign a contract for 10 years, this is what I'd like, we'll see."
De Bryune signed for City a year before Guardiola's arrival and has won six Premier League titles, two FA Cups and five EFL Cups while also helping them to their first-ever Champions League triumph during the 2022-23 season.
"There are players for whom the impact on the legacy of this club will be eternal, will be forever," said Guardiola.
"Of course, it is not easy to replace [them], but as a club, we have to find in the moment, if it's going to happen, we have to find the best way."
Before the game against Forest, Guardiola had to brush aside suggestions of a rift between himself and De Bruyne.
"People say I've got a problem with Kevin. Do you think I like to not play with Kevin? No, I don't want Kevin to play?" he said.
"The guy who has the most talent in the final third, I don't want it? I have a personal problem with him after nine years together?
"He's delivered to me the biggest success to this club, but he's been five months injured [last season] and two months injured [this season].
"He's 33 years old. He needs time to find his best, like last season, step by step. He'll try to do it and feel better. I'm desperate to have his best."
'Milan shown lack of respect' - Fonseca bemoans refereeing in Atalanta loss
Paulo Fonseca thinks referee Federico La Penna showed AC Milan "a lack of respect" during their 2-1 defeat by Atalanta.
Ademola Lookman's late strike settled the contest at Gewiss Stadium, where Alvaro Morata cancelled out Charles De Ketelaere's earlier effort.
While Atalanta climbed to the Serie A summit following a ninth straight win, Milan saw their seven-game unbeaten streak across all competitions come to an end.
However, Fonseca suggested his side were on the wrong end of questionable officiating, including for the hosts' first goal, where he felt De Ketelaere pushed Theo Hernandez while climbing to head home.
"I am not afraid to speak the truth," he told Sky Sport Italia. "I have always respected the work of the referees. I realise they have a difficult job, but every week, it is always the same.
"The way the referee officiated throughout this evening was a lack of respect for Milan.
"The first goal, [there] was a clear foul, there is absolutely no doubt. The way the referee officiated throughout was against Milan, there is no doubt."
Although, Fonseca acknowledged poor defending from set-pieces proved costly for his side.
"At the end of the day, we lost the game on two set-plays," he added. "The first half was very good, but in the second, we didn't have that link with the strikers.
"I think we deserved more tonight, it was tough to accept conceding two goals from dead-ball situations."
Meanwhile, Atalanta coach Gian Piero Gasperini revelled in his side's victory, which lifted them to the top of the table and already had their supporters chanting songs about winning the Scudetto.
"Naturally, this is a great victory against a team with undoubtedly very talented players among the best in the league, and we thoroughly deserved the win," he said.
"The people of Bergamo have their feet firmly on the ground, so don't take anything for granted. If we were still up there after another 20 games, it'd be different, but as things stand, it is an expression of joy and a deserved one, too."
Luis Enrique has 'nothing to complain about' despite PSG's stalemate with Auxerre
Luis Enrique insists he has "nothing to complain about" after Paris Saint-Germain were held to a goalless draw by Auxerre.
The Ligue 1 leaders dropped points for the second game running after an inspired performance by Auxerre goalkeeper Donovan Leon at Stade de l'Abbe Deschamps.
Fabian Ruiz saw a first-half goal chalked off for offside as PSG failed to score in a league game for the first time this season.
Their cause was not aided by Leon, who made 11 saves during the match - the highest tally for a goalkeeper who has kept a clean sheet in the French top flight.
Nevertheless, Luis Enrique focused on the positives of his side's performance against Nantes, who have only lost one of their seven league games on home soil this term.
"It's clear that the result does not reflect what happened on the pitch, but we were up against the second-best team at home. We have created many chances to score," he told reporters.
"Obviously, the unfinished business is scoring goals, which is what wins games, but I have nothing to complain about my team. We have tried until the end, all we have to do is keep on trying.
"This is a team that scores a lot of goals and creates a lot of chances. If we are unlucky, I will never criticise my players for missing an opportunity to score. I just encourage them to keep building confidence and improve."
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