Monaco have looked to the Eredivisie to strengthen their defence with the signing of Terence Kongolo on a five-year-deal from Feyenoord.
The 23-year-old Netherlands international made 23 appearances for Feyenoord as they claimed the Eredivisie title, and will move to the principality for a reported fee of €13 million.
"I am very pleased to join AS Monaco,” Kongolo said. “I will discover an exciting new challenge at a prestigious and ambitious club.
"I look forward to meeting the staff, my new team-mates and doing the best on the field to help the group."
The French side will have to reshuffle their squad after winning the Ligue 1 title last season, with Bernardo Silva joining Manchester City while Tiemoue Bakayoko, Fabinho, Benjamin Mendy, and Kylian Mbappe are all being linked with moves away.
And with some of last season’s champions set to depart, Monaco general manager Vadim Vasilyev said of Kongolo that they “believe very much in his potential and we are convinced that he will find in Monaco the conditions to flourish."