Jurgen Klopp said he could use a Javier Mascherano-type solution amid Liverpool's injury crisis in the centre of defence.
With Virgil van Dijk and Joel Matip sidelined, Liverpool were dealt another blow on Tuesday, when Fabinho – playing at centre-back instead of midfield – hurt his hamstring against Midtjylland in the Champions League.
Joe Gomez is the only senior centre-back available for Saturday's clash at home to West Ham, while Nathaniel Phillips, 23, Billy Koumetio, 17, and Rhys Williams, 19, are also options.
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Klopp said he had expected Phillips, who was on loan at Stuttgart last season, to leave the club.