The Central Coast Mariners have continued their youth development policy by signing two teenagers on long-term deals, including handing a senior contract to the youngest player in A-League history.

Anthony Kalik, 15, penned a three-year deal with the Mariners to become the youngest professional footballer in Australia, narrowly eclipsing the previous record set by Newcastle Jets' Ben Kantarovski in January 2008.

Still nearly three months away from his 16th birthday, the attacking midfielder became part of the long-term future of the A-League champions on Friday after agreeing to move to Gosford following the completion of his Australian Institute of Sport program early next year.

Kalik will join fellow AIS teammate Liam Rose at the Mariners' centre of excellence in March. Both will be selected in the club's Asian Champions League squad and could even be registered for the A-League as potential injury replacements.

The duo follow former prodigy Mustafa Amini in graduating from the revised AIS program to the Mariners. Coach Graham Arnold hailed them as potentially the best youth products yet.