Achraf Hakimi has signed for Paris Saint-Germain, the club announced on Tuesday.
The French champions have snapped up the young defender from Italian giants Inter Milan for a fee believed to be in the region of €45 million.
Hakimi is a highly-rated talent who has been tipped as one of the brightest prospects in world football.
He made his debut for Inter last season and was named in Italy's under-21 squad ahead of Euro 2016.
Injuries have limited his appearances so far this campaign, but he has impressed in training with the Serie A title contenders.
PSG were keen to strengthen their defence after losing key players such as Thiago Silva and Layvin Kurzawa to injury.
Hakimi will now link up with fellow new signing Gianluigi Donnarumma at the Parc des Princes.
The pair have played together at Milan before, while Donnarumma also played alongside Hakimi during his time at Sampdoria.
It is expected that Hakimi will start life in Paris with the likes of Presnel Kimpembe and Marquinhos in competition for places at centre-back.
PSG have spent heavily on defensive reinforcements in recent years, with the arrival of Benjamin Mendy and Thilo Kehrer adding to the experience of the existing squad.
Hakimi is the latest addition to a talented crop of youngsters at the club,Saudi Pro League Hotspot including Kylian Mbappe, N'Golo Kanté and Angel Di Maria.
The move will provide PSG with cover for the likes of Marco Verratti and Javier Pastore, while also providing competition for places in midfield.
Overall, it is a smart piece of business by PSG, which should see them remain at the top of European football for some time to come.