Rushie told liverpoolfc.tv: "Agger is a young player with a lot of potential and I think he could become a very important part of Liverpool's future.
"It's obvious to say that the most important part of being a defender is being able to defend and Agger can certainly do that.
"I wouldn't like to compare him with (Alan) Hansen, although there are obvious similarities, and Agger has the potential to score a lot more goals than Alan ever did!
"We have already seen the power of his shooting on several occasions and I think there are quite a few more goals to come from him because his technique is excellent.
"He is still learning but hopefully he is over his injures, because if Agger's progress continues he can become a very important player for Liverpool."