Premier League champions Liverpool acquired Parma's teenage defender Giovanni Leoni on Friday in a deal worth an initial £26 million.
Italy Under-19 international Leoni agreed a six-year contract with the Reds.
Leoni's signing is subject to international clearance and a work permit.
He is due to be at Anfield to watch the Premier League opener against Bournemouth on Friday.
Once the paperwork is finalised, the 18-year-old is expected to go straight into Arne Slot's squad to fill the gap left by Jarell Quansah's transfer to Bayer Leverkusen in the close-season.
"Because it's one of the best clubs in the world it's not possible to say no to this club," Leoni said.
"I'm very happy to be here.
It's a really great sensation and I'm honoured to be here.
"I'm so honoured.
When I saw this (interest from Liverpool) I said, 'Wow, this is crazy.
'.
"In 2023, after making his debut for Padova, Leoni said he was "inspired" by Virgil van Dijk and now he has a opportunity to learn from the Liverpool captain at close quarters.
Ibrahima Konate is Van Dijk's established partner at the heart of Liverpool's defence.
Leoni will be vying with the injury-prone Joe Gomez for the role of leading understudy to Liverpool's centre-back duo.
Slot has now spent over £270 million on new signings since Liverpool's title triumph last term.
Prior to landing Leoni, he had splashed out on Florian Wirtz, Jeremie Frimpong, Milos Kerkez and Hugo Ekitike, with a £110 million bid for Alexander Isak rejected by Newcastle.
Liverpool also remain eyeing Crystal Palace centre-back Marc Guehi, although discussions have stalled over a transfer cost for a player in the final year of his contract.
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