The 24-year-old's arrival will ease the injury problems Liverpool are facing, with central defenders Mamadou Sakho, Dejan Lovren and Martin Skrtel all on the sidelines.
Caulker, who spent the first half of this season on loan at Southampton, started his career at Tottenham Hotspur before moving to Cardiff City.
Caulker has been on loan at Southampton but has found first-team opportunities limited, making just eight appearances for the Saints, including just one in the league.
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