Arsenal boss Arsene Wenger was unhappy with match officials after their shock 3-2 defeat at Swansea City.
Wenger felt ref Michael Oliver influenced the result.
The Frenchman said: "The game was difficult as Swansea played well, but the game was decided by some strange decisions, the first by the referee was the penalty which was a complete imagination and it was a good dive by the player.
"From then on there were other turning points like when we got back to 2-2 and made a defensive mistake, we showed a lack of appreciation for the ball and the defensive performance was not good enough.
"At 2-2 I thought we had a good chance to win as we looked dangerous and the keeper did well to keep them in the game and made some great saves, and we missed some unbelievable chances."