Defender van der Hoorn arrived at the Liberty Stadium in the summer of 2016 after the Swans agreed an undisclosed fee with Ajax to bring him to the Premier League.
The centre-back penned a three-year contract in SA1, and made 11 appearances during his maiden season as a Swan.
Having started his career with Dutch club Utrecht, where he was named player of the year in 2013, van der Hoorn earned a transfer to Ajax.
The move to Amsterdam proved successful, as van der Hoorn lifted the Eredivisie title in his first season as an Ajax player before helping the club finish runners-up in the two following campaigns.
He made 43 appearances – scoring three goals – in three years at Ajax.
A powerful figure who is a big aerial presence, van der Hoorn has chipped in with a healthy share of goals for a player whose first job is to defend throughout his career. His first Swans goal came in the home game against Manchester United in November 2016.
On the international front, he was called up by Holland in 2013, though he is yet to win his first cap.
He has, however, represented his country at youth level.