The former Barcelona junior is interesting the Reds ahead of the summer market.
Keita's agent, Ulisse Savini, told Radiosei: "If he was to leave Lazio, we will never find a club in Italy that will buy him, assuming the important figures that [Lazio president] Claudio Lotito would ask for.
"How much is he worth? If a say a price Lotito will contradict me. But at present, according to my judgment, he cannot be worth less than €15million.
"I think Keita would be fine with a future in English football. I think that it is much better there than in Germany, for example."
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