Arsenal manager Arsene Wenger says his players were not focused enough during their 3-2 defeat away at Manchester United.
The Gunners desperately needed all three points to stay in touch with leaders Leicester City.
But they couldn't handle the pressure of such a big game as they fall five points from Claudio Ranieri's side.
"We played with a lot of intensity," Wenger told BBC Sport.
"I cannot fault our commitment and spirit and desire but I feel we conceded too easy goals.
"I think after the game we have to be positive and prepare for the next one. We have another game on Wednesday, they come thick and fast and you want to keep a good mentality.
"We did fight until the end, we had a lot of the ball but I think we could avoid the goals with better concentration.
"I am disappointed because we lost the game but we will focus on the next one. This is a fight where you go to the next one and aim to come back even stronger."