Houllier said: "Everything starts from the back and we could do better in that area. Not only your defending, but your attacking and passing.
"It is not my philosophy to point the finger at someone who misses a sitter or doesn't prevent a goal he should have done. But we are dealing with it internally.
"Between now and the end of the season we will be monitoring a few things. We have to be a lot tighter. Have we the personnel to do it? I will decide on that at the end of the season.