â€śWe made mistakes and they took advantage of itâ€ť he told Sky Sports.
â€śThey were sharper than us in the final part of the game. Itâ€™s difficult to swallow but football is 90 minutes [long].â€ť
The defeat leaves the Gunners six points behind league leaders Chelsea and virtually out of the title race.
â€śI donâ€™t have to describe how annoying it is."
â€śWe have to continue to fight" he continued.
"Today is a game we couldnâ€™t afford to lose but we have to continue to fight.â€ť
Attention will focus on the mistake made by the Gunners Polish keeper Lukasz Fabianski with the score at 2-1.
The Frenchman admitted that the stoppers mistake was a major turning point, adding: â€śI think he [Fabianski] would accept that as well."