It is "paramount" that Liverpool sign a central defender in the January transfer window after Joel Matip sustained another injury, says former star Jamie Carragher.
The Reds' defensive crisis worsened on Sunday when the 29-year-old was taken off in the second half of their 1-1 draw with West Brom.
The reigning Premier League champions are already without star defender Virgil van Dijk, who suffered a cruciate ligament injury in October and could be out of action until April.
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Although coach Jurgen Klopp has the likes of Rhys Williams and Nathaniel Phillips to call on to partner Fabinho at the heart of the back line, Carragher feels must bring in extra cover as soon as possible.