Liverpool have completed the signing of Denmark international defender Daniel Agger on a four-and-a-half year deal.
Agger is regarded as one of the most promising defenders in Europe
The 21-year-old joins for a fee of around £5.8m from Brondby after passing a medical and agreeing personal terms.
"Daniel will be one of the best centre-backs in England in the future, I am sure of that," said Liverpool manager Rafael Benitez.
"A youngster like Danny can be worked with and he can become Liverpool's centre-back for the next 10 years."
Benitez added that signing Agger ended a long search for a new central defender.
"We have been looking a long while for a centre-back, we have looked all around the world," said Benitez.
"But Agger has the great qualities we wanted. He is good with the ball but also with his positioning.
"He already has international experience and a great future the kind of player that I like.
"If you are 21 and you can train and work with Sami Hyypia and Jamie Carragher you can learn a lot. It will be fantastic to have these great players to help him progress."
Agger said after signing that he expects a tough fight for first-team football at the club.
"My aim is just to become a better player and win trophies and I hope Rafa can help me do that," said Agger.
"It is a big job to displace Jamie and Sami from this team but that is my job and I will fight for my place.
"I know it will be difficult to break into this team, they are the champions of Europe.
"I am aware of my countryman Jan Molby being at Liverpool. I know how good a player he was and what a great hero he was here, but if I can do anywhere near as good as him here I will be happy."
Agger was pulled out of a training camp with Brondby so he could complete his switch to Anfield.
And Benitez said he had been impressed with Agger's attitude during talks with the player.
"It was important he said he wants to play for us," said the Reds boss.
"We have talked to lots of players and agents but the first time we spoke to Danny he said it was a dream to play for us.
"For the most part, players think only of money. If you are going to play for Liverpool you must think of other things first.
"We need good players to win trophies. It is hard to find them before they are 20 or so, but that is what we must do.
"We have a good team and with that you can sign young players and give them time to learn."
Agger is a long-time Reds' target but the move almost fell through when Brondby raised their price.
The Dane is due to join up with his country's under-21 squad for a two-week training camp in Chile on Monday.