Dutch central defender Matthijs de Ligt signed on Thursday for Juventus from Ajax for a fee of €75 million ($84.2 million), the Italian champions said.

The 19-year-old has signed a five-year contract.

Juventus said in a statement the €75 million would be paid over five financial years, with "additional costs" of €10.5 million.

The combined fee makes De Ligt the world's most expensive defender, surpassing the €84 million Liverpool paid to sign his Netherlands teammate Virgil Van Dijk from Southampton in 2018.

The fee for De Ligt makes him Juventus' third most expensive signing in their history after the €105 million they paid for Cristiano Ronaldo in 2018 and the €90 million transfer of Gonzalo Higuain in 2016.

De Ligt had also been linked with Manchester United, Barcelona and Paris Saint-Germain after his impressive performances for a young Ajax side that reached the Champions League semi-finals last season.

His Ajax teammate, 22-year-old midfielder Frenkie de Jong, has already joined Barcelona.

In a deal hammered out by his powerful Italian-born Dutch agent Mino Raiola, De Ligt will earn a basic annual salary of 7.5 million euros that could reach 12 million euros with bonuses, according to reports in Italy.

"The sporting project proved decisive" in De Ligt's decision to choose Juventus. "For a defender, Italy is always an ideal place."

The Turin-based club, now coached by former Chelsea mentor Maurizio Sarri, were keen to bring new blood into an ageing defence that features 34-year-old Giorgio Chiellini and Leonardo Bonucci, 32.

De Ligt played 117 games for Ajax in all competitions, scoring 13 goals. He scored the winner in Turin as Ajax eliminated Juventus in the Champions League quarter-finals.

De Ligt has played 17 times for the Netherlands, forming a formidable central defensive partnership with Van Dijk.

He took over the captain's armband at Ajax in March 2018, making him the club's youngest ever captain.

De Ligt said Ronaldo had urged him to join Juventus after the two faced each other for their countries in the Nations League final in June won by Portugal.

Netherlands coach Ronald Koeman says De Ligt "will become one of the best defenders in the world in a short time".