Chelsea caretaker boss Frank Lampard says low confidence remains the key factor after defeat at Arsenal.
The result meant a sixth defeat in six games since Lampard took charge.
He later said: "As a manager, going to manage for a long time, I played for many a game, I played in fantastic teams and we had halves like that. You have to react. When you have halves like that at a moment and come to a team like Arsenal, you get what you deserve. The answer is a little bit too late, too retrospective, it has to be from minute one.
"To be fair the feeling before the game was good, the energy in the room was good but at the moment I know it's much harder to take good energy. The lads are good lads, not bad intentioned, to take it onto the pitch is the important thing. Tonight is another lesson of what it has to be when we go to Bournemouth, who are playing really well, going to Forest fighting their lives and last three games of three of the top four, we have to bring that.
"I motivate them and I do my job. I understand that the role of an interim as such, especially when there is no clear goal in position, makes it difficult. In my short time here, and the more I'm here in the short period I'm becoming more practical about it. The players that do show that they train well, they have their motivation. It's not always the shouters, it can be the quiet ones that have the motivation, will be the ones that continue to try and get improvement in this five games until the end of the season.
"As the club moves forward that will have to be the case all of the time. That's what top clubs have, somewhere this season we've lost that kind of feeling. There can be loads of factors to it, I don't care about the factors in my position. I've only got five games and four weeks until the end of the season. All I care about now is seeing a better first half than I saw, and even the second half was good but it's still not what we can do. "
He added: "I think it's a mental desire, to get up to people. It also starts with the capacity to be able to do it. If you haven't been conditioning and doing that and you don't do it on Wednesday, don't do it on Thursday, you won't do it on Saturday or whatever day you want to talk about. When those things become you as a group, they don't change overnight and we're seeing that at the moment."