The Denmark centre-back scored the first in the 2-0 win over Hull, with Luis Suarez netting the second with a now trademark free-kick to take his tally to 20 in 15 matches, becoming the fastest player in Premier League history to achieve the feat.
It was far from their best or most fluid performance, but after back-to-back defeats had seen them fall from first to fifth a victory was all that was required to get Liverpool back on track.
"The most important thing was three points, it is as simple as that," Agger told LFC TV.
"It was not our best performance, but if we can win and get three points without playing our best that is important in the long run.
"Not only was it important for confidence but also just to stay in the top (four).
"That is so important to hang in there and we have done that."