Kalik secures four-year Hajduk contract
Parent club Central Coast will earn AU$50,000 from the deal after the 18-year-old had joined Hajduk on a six-month loan in February.
Kalik still had another year on his Mariners contract and follows the likes of Mat Ryan, Mustafa Amini, Tom Rogic and Trent Sainsbury as a young talent leaving Central Coast permanently for a European club.
Hajduk boss Damir Buric took a liking to the ex- Sydney FC junior after his arrival, using him regularly in central midfield.
Kalik impressed with 12 appearances for the club, including nine starts in the second half of the 2015-16 season.
Hajduk finished third in the Croatian Prva HNL, qualifying for the Europa League second qualifying round.