Hyypia has spent the last 10-years at Anfield and will join German side Bayer Leverkusen at the end of the season.
Agger said: “He will be a great player for Bayer Leverkusen. They are signing one of the best defenders in England.
“People say he doesn’t have as much pace as he did, but when you have the intelligence Sami has you do not need to be quick.
“If you can read the game the way he can and work out where the ball is going before anyone else pace is not that important. He can still play at the top level because he looks after himself and trains hard every day.
“And he is still hungry to win football matches.”