Arsene Wenger admitted that Chelsea's defensive prowess had been the difference between the two sides in the Blues' 2-0 victory at Stamford Bridge.
Two first-half goals from Didier Drogba decided the game, with Wenger's side all but out of the Premier League title race as a result after failing to turn possession into chances.
He said afterwards: "You have to congratulate Chelsea. We did not get a demonstration of football, but they were efficient and that is what made the difference.
"The first goal contributed to our defeat, but apart from that we had great spirit and attitude. We could not get back to 2-1 and get them really wobbling.
"They defended very well. We were unlucky with one or two decisions from the referee, but we had mountains of possession. We could not transform it into goals.
"We had 70 per cent of possession today. We were always attacking but in a big game like that when you are 2-0 down, you demand too much.
"I am completely happy with the performance and spirit. We didn't turn up against Manchester United, but today we had the expected performance.
"We were completely dominant. I always had the feeling we could come back, but you have to give Chelsea credit. They are very experienced at the back."