Arsenal manager Arsene Wenger has been left puzzled by his side once again failing to turn up in big game after they went down 6-0 at Chelsea.
The heavy defeat on Saturday lunchtime ruined Wenger's 1,000th match in charge and severely dented any title ambitions, with the Gunners now down in fourth place, albeit still with a match in hand on the leaders.
Wenger's team appeared to have learned no lessons from their 6-3 defeat at Manchester City earlier this season and the subsequent 5-1 mauling at Liverpool - where they trailed 4-0 inside 20 minutes - as Arsenal were torn apart by Jose Mourinho's rampant Blues during a blistering opening spell.
The French coach is expecting a response against Swansea on Tuesday night, but admits he needs to get to the bottom of why the players again failed to deliver a big performance when it was needed the most.
"We felt we prepared properly, but we did not turn up, so it is puzzling," Wenger said.
"After 20 minutes, it was game over and it became a long, dramatic and dreadful afternoon.
"That is the most disappointing, when you prepare with the intensity that we do, you then turn up for your game of the season and are never even in it.
"This is puzzling because we were shocked and knocked down basically without feeling you have had a chance.
"The team is healthy and willing, but still the way it happened against Chelsea, we have to think deeply about because it is not the first time and (we have) to respond in a proper way on Tuesday."