Arsenal boss Arsene Wenger says missed opportunities and yet another defensive mistake were all reasons why his side lost away at West Bromwich Albion.
The Gunners are still without a win in November having lost 5-1 to Bayern Munich and only managing a draw against Tottenham Hotspur in the North London derby before yesterday's game.
"It was a bad afternoon," Wenger told reporters.
"We missed a penalty, we gave a goal away on set-piece, that is perfect to make your afternoon a nightmare and we missed open goal chances.
"I believe that West Brom they were strong in the fight and they had one 100 per cent commitment as well and you have to give them credit for that.
"But overall I felt it dropped a huge blow when we scored and we just had to make sure they didn't come back with a easy goal and that is where we were disappointed today.
"But I cannot be mad at the team because they gave what they could until the last minute but we lost a bit of focus at 1-0 - at 35 minutes we were 1-0 up and then at 45 we were 2-1 down. Our defending on that level was very, very poor."
Asked what happened with Santi Cazorla's penalty, the Frenchman explained: "I don't really know what happened.
"You can talk to him and he is so disappointed and it is difficult to blame Cazorla for that. We have to take it on the chin and bounce back in our next game.
"It is a big blow today for us as if the game reflects the result then okay but when you drop points when you have come out of a game and think you have not done the maximum to produce you cannot be happy."