Mikel Arteta defended his Arsenal players and refuted claims the pressure of the top-four race had got to them after Monday's 3-0 defeat at Crystal Palace - but conceded it was an "unacceptable" result.
The Gunners were blown away by their old captain Patrick Vieira, who saw his side go two up inside 24 minutes through Jean-Philippe Mateta and Jordan Ayew before Wilfried Zaha's late penalty added some deserved gloss.
A 5-1 win for Tottenham over Newcastle on Sunday saw them leapfrog rivals Arsenal in the race for Champions League qualification but Arteta hit back at suggestions his young side are feeling the heat following a chastening night.
"Overall, it is unacceptable, we hold our hands up, me the first one and apologise, we regroup, tomorrow is a new day and a new opportunity to start to prepare against Brighton," the Gunners boss said.
"The pressure has been there for the last seven or eight weeks and we are talking all the time about the race and the top four and this is while they have been performing extremely well, getting results and playing well.
"Today we didn’t perform and it is as simple as that. We were second best in every department, especially in the first half."
Arsenal had won six of their previous seven fixtures before visiting Palace but looked unsettled from the outset and it was no surprise when Mateta nodded in a 16th-minute opener following Joachim Andersen’s header across goal.
It was 2-0 eight minutes later when Ayew collected Andersen’s pass and bent his shot around Aaron Ramsdale and into the bottom corner. Selhurst Park was rocking now but Arteta would have again been left aghast at the defending of Gabriel Magalhaes and Nuno Tavares.
The second half was better for the visitors but Emile Smith Rowe and Martin Odegaard squandered fine openings before Zaha’s excellent run won a spot-kick, which he converted to make it 3-0.
"No, we have a game in hand still," Arteta replied when asked about whether Spurs being fourth had been a psychological blow to his team.
"We know in the nine games a lot of things are going to happen. We have to play each other, we have to play some big games coming up and we have to focus on ourselves. The problem we had today was not Spurs, it was us and what we did in the first half."
To compound a poor night for the Gunners, Thomas Partey limped off in what Arteta described as a "big concern" while Kieran Tierney is set for a scan on Tuesday that will determine the extent of a worrying knee injury.
On Tierney, Arteta said: "He is seeing the specialist tomorrow and we will know more about the extent of the injury but the feeling that he had wasn’t really positive and what the scan showed either. We have to wait and see what happens."
Victory for Palace moved them up to ninth and extended their unbeaten run to seven matches ahead of their trip to Wembley in a fortnight for an FA Cup semi-final against Chelsea.
Eagles manager Vieira said: "It was a really good performance. I think from the first minute we wanted to put pressure on them and not allow them time on the ball. We did that well.
"I think there is more belief in the team, players understand better each other and start to really know each other as well.
"There is a clear idea of how we want to play and today we scored those goals in really important moments of the game. I also think the way we managed the game showed that we are growing up as a team."
Vieira spent nine years as a player at Arsenal and won three Premier League titles at Highbury.
Asked if he felt sorry for damaging his old club’s hopes of a Champions League return, he replied: "No, our main focus was to win the game."