Arsenal manager Arsene Wenger says pressure in the second half against Leicester City was largely down to last Saturday's tough away game against Tottenham Hotspur.
The Gunners were in total control after the first 45 minutes of the game with Laurent Koscielny and Theo Walcott both on target but struggled after Andrej Kramaric's first goal in the Premier League.
And Wenger says fatigue played a role in the final part of the game.
"I feel that we were in control for the first half but when we were in control they had one or two good chances on the counter-attack," Wenger said.
"In the second half we lost our cohesion, our technical superiority and Leicester was always dangerous going forward.
"They are very quick in transition from defence into attack. At 2-1 we became a bit nervous but overall what was important for us was to get the three points.
"[The North London derby] was a bit in their [the players'] head, especially in the second half in the legs.
"Tottenham lost in the last minute as well. It was a very intense game on Saturday and three days later, it's not easy."
Asked if the Gunners can fight for the title, the Frenchman said: "No, I consider us in the top-four race.
"[But] four, five or six [will fight for a top four finish]: Chelsea, Man City, Man United, Liverpool, Tottenham, Arsenal and Southampton."
