Spanish club CD Castellón has concrete interest in Jari Vlak, the 27-year-old Dutch central midfielder and captain of ADO Den Haag. Castellón has approached ADO Den Haag regarding Vlak. Vlak would like to make the transfer, and it has been reported that he has indicated this internally. Discussions concerning a contract extension between Vlak and ADO Den Haag have been put on hold because of the interest from Spain. His current contract was signed when he joined in February 2024 and runs until June 2027. The personal terms for Vlak are not an obstacle.