Liverpool managed to keep a clean sheet for the first time since the victory over Everton at the start of October and Agger believes the shut-out at the Hawthorns will boost his side's confidence.
"It was so important for us to keep a clean sheet and that is always good for us defenders and great for the whole team as well," Agger told Liverpoolfc.tv.
"I thought we played well and deserved the three points. We are happy and we have to continue this form and keep winning games.
"I think we can take a lot from this result and we now look ahead to the next game against Swansea at home and try and get another three points."