Chelsea manager Frank Lampard admits that he felt Sheffield United could come back in their 2-2 draw.
The Blues were in a 2-0 lead after a fantastic start to the game.
However, their levels dropped in the second half and the newly promoted side earned a share of the spoils.
"I wasn't happy. I was not overly happy with the first half," Lampard said to reporters.
"I thought they gifted us two goals. I thought our performance was okay. I felt we were in a dangerous position. I was very clear about that. It wasn't a happy half-time.
"The warning signs were there in my opinion and we didn't react to that on the pitch. No, [it wasn't the fault of individuals]. It was general. I thought generally we had to move the ball quicker. We were taking too much time.
"We worked a lot on Sheffield United and their style of play and how we could move the ball to give them problems. I don't think we were doing it as I wanted us to do it and I think that was a contributing factor. I was feeling we were slow in possession that was giving them opportunities.
"I saw it coming. If we were to go out and make a mistake, it wasn't bad in the first half, but there were signs that we needed to tighten up. That was the message. I am asking for different things in the way we play and the movement of the ball.
"There have been signs in all our games, but not enough as far as I am concerned. Everyone has different reasons, younger players have to grow up and older players worry about themselves as well as helping others."
