Bayern Munich have completed the signing of Matthijs de Ligt from Juventus in a deal worth a reported €80million.
The Netherlands international has agreed on a five-year contract with the Bundesliga champions, ending his three-year stint in Turin.
De Ligt becomes Julian Nagelsmann's fourth signing of this window after Sadio Mane and former Ajax duo Noussair Mazraoui and Ryan Gravenberch.
The defender had two years remaining on his contract at Juventus - for whom he played more minutes than any of his outfield teammates in Serie A last season (2,675).
Bayern have reportedly agreed to pay the Bianconeri an initial €70m, with a further €10m in add-ons.
Speaking to the club's website after his signing was confirmed, De Ligt said: "I'm very happy to become a player for this great club. FC Bayern are the most successful club in Germany, one of the most successful clubs in Europe and in the world.
"I felt the genuine appreciation from the sporting management, the coach and the board right from the start, which convinced me. On top of that, FC Bayern is a brilliantly run club with big aims. I'm very glad that I'm now becoming part of the FC Bayern story."
Bayern president, Herbert Hainer, added: "Matthijs de Ligt was a top target for us. With signings like this, the big aims that we have are achievable.
"The future face of our team is increasingly taking shape, and this transfer is an important building block in the overall concept that we're gradually putting into place. De Ligt should become a mainstay at FC Bayern."