Date of birth
Sheffield Wednesday signed Joost van Aken for an undisclosed fee from Eredivisie side SC Heerenveen in August 2017.
The Dutchman signed his first professional contract with Heerenveen in 2013 and went on to become a key figure for the club.
His consistent and commanding performances in central defence were rewarded in 2015, when the Haarlem-born stopper signed a new three-year deal with the top flight Dutch outfit.
He made 26 appearances during the 2016/17 campaign and scored on his final outing of the season in a 3-0 win over Sparta Rotterdam, as Heerenveen secured a mid-table finish.
In total, van Aken made 90 appearances for Heerenveen before his switch to S6.
Strong in the air and comfortable in possession, van Aken has been capped three times at international level by the Dutch Under-21s.