Arsenal manager Arsene Wenger says the Gunners were unlucky not to get anything away from Stamford Bridge on Sunday afternoon.
The visitors had ten shots in the game but none on target with the Blues going on to win 2-0 with Eden Hazard and Diego Costa getting the two goals of the game.
And according to the Frenchman, Chelsea's "financial power" was key to their success.
"It was an even game, but at the end of the day they have financial power and used it in an effective way with players like Diego Costa and Eden Hazard making the difference.
"They did not work our keeper more than we did their's.
"We had more shots and missed opportunities to take more. We lost on details and this is unfortunate."
Asked what happened in the first half when he clashed with Jose Mourinho, the Frenchman said: "I went out of my technical area because I wasn't happy with the challenge and I wanted to see what happened.
"Someone stood in front of me and that was it. I say absolutely nothing else on that.
"Jose says we should have finished with eight men and I return that compliment.
"I don't know how Gary Cahill finished the game. I don't know how Branislav Ivanovic finished the game. I don't know how Oscar finished the game.
"It is a concern to be nine points behind Chelsea, with the quality of the teams ahead of us, but we will keep on fighting and go on to the next game."