It is understood the Reds will pay £26million plus add-ons for the 18-year-old.
Leoni is expected to undergo a medical on Thursday as head coach Arne Slot has moved to strengthen his options at centre-back.
He played most of pre-season with just two recognised specialists in the role – Virgil van Dijk and Ibrahima Konate – as Joe Gomez, who returned to training this week, was injured and Jarell Quansah was sold to Bayer Leverkusen.
Liverpool are still interested in Crystal Palace’s Marc Guehi, who has a year left on his contract, but have so far been unable to agree a fee.
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