Pepe Reina believes that Daniel Agger and Martin Skrtel can be compared to the best defensive pairings in Liverpool's history.
The pair have committed their long-term futures to the club by signing new contracts since the start of the season.
As well as making favourable comparisons with Jamie Carragher and Sami Hyypia, Reina feels that the duo are at the top of their trade in the Premier League.
"It's good they've signed contracts because it's a fact that they are one of the best centre-back couples in the Premier League," Reina told the official Liverpool website.
"The understanding between them is great and they've been really solid lately. In the last year and a half or so they have been brilliant for us.
"It's great for the club and I'm happy for them that they've got new deals.
"If I am not mistaken they are similar ages to each other, so they have five or six years still to play their best football.
"I don't see any reason why they can't do the same as Carra and Sami did, though they were one of the greatest centre-back couples this club has ever had."