RAFA Benitez blasted Chelsea's first-half display as Chelsea survived a scare at League One Brentford.
Fernando Torres' late leveller earned the Blues another bite of the cherry after a 2-2 draw at Griffin Park in the first meeting between the sides since 1950.
Chelsea trailed twice but second-half goals from Oscar and Torres ensure they were in the hat for the FA Cup fifth round draw.
But Benitez was unhappy with his side's showing in the first 45 minutes as the Bees ran the show.
He said: “In the first half we didn't do what we had to do.
“We knew it would be difficult but we made too many mistakes in our approach and the way we wanted to play.
“They were pushing and we knew it could be difficult, but we kept giving the ball away in simple situations which we could have managed better.
“You have to perform, we didn't start well and they grew into the game.”
Losing 1-0, Benitez brought on Juan Mata at the break in a bid to avoid an upset.
And the Spaniard was pleased with his side's response in the second-half.
He said: “I was very pleased with the reaction of the players, we showed quality, character and it was much better.
“I changed [Juan] Mata at half-time and he made a big difference. We were controlling the game and I thought I would bring Demba on for the last 10-15 minutes to try to do something.
“We were on top of them, but sometimes it's good if you change things, and Demba did a great job on the left.
“In the second half we showed our real level, like we did last week against Arsenal. We have no excuses as to why we didn't play well in the first half, we just didn't do the right things.”
Follow me on Twitter.