"His performance in the Community Shield was particularly significant, because I'm sure that convinced the manager Agger was now ready," said the Dane.
"Now he's built on that against Sheffield United, West Ham and PSV. His strength is his maturity and ability to handle any situation he faces. It doesn't matter how big the game is, nothing fazes him.
"That's been shown for his club and at international level ever since he made his debut for Brondby. It was obviously an important game for Liverpool's defence on Tuesday, so for Agger to come in an perform like that shows his quality.
"There were unrealistic expectations in Denmark when Agger first signed, with some people expecting him to force his way into the team immediately. That was never going to happen, but the few months he had here last year have worked to his advantage."