Arsenal goalkeeper Wojciech Szczesny has admitted that the team must learn to focus more following their defeat to Swansea City.
The Gunners let a lead slip for the second time in a week on Sunday as they went down 2-1 at the Liberty Stadium.
The result has left Arsenal 12 points behind leaders Chelsea in the Premier League table after 11 games.
"For the majority of the game we looked solid at the back and we looked dangerous," Szczesny told the club's official website. "We had a poor five-minute spell and at this level it costs you.
"It could've gone either way but it didn't. You can't just hope that the next one will be different and we'll get a bit of luck - we need to focus for 90 minutes and do our jobs properly offensively and defensively. Then things will change."
Arsenal are back in action on November 22 when they welcome Manchester United to the Emirates Stadium in the Premier League.
