Liverpool have completed a loan deal for Schalke's Turkey central defender Ozan Kabak.
The 20-year-old joins the Reds until the end of the season, with the club also having signed Preston North End's Ben Davies for £2m.
While defender Davies, 25, has signed a “long-term deal” at Anfield.
Liverpool has an option to buy Kabak for £18m - with add-on clauses - at the end of the season, but do not need to activate it until June.
For now, they will pay a £1m loan fee now with the potential for an extra £500,000 based on games played and how they fare in the Champions League.
The Reds are missing experienced centre-backs, with Joel Matip out for the rest of the season and Virgil van Dijk and Joe Gomez out with long-term injuries, while midfielder Fabinho, who has been standing in at the back, is also out.
Manager Jurgen Klopp named his 12th different centre-half partnership in 21 Premier League games for Sunday’s 3-1 win against West Ham, with midfielder Jordan Henderson alongside Nathaniel Phillips.
