Jacob Poscoliero joined the Central Coast Mariners in October 2014 and made his Hyundai A-League debut against Wellington Phoenix in Round 2 of the 2014/15 season. A versatile player capable of being deployed at right stopper, right back, or in midfield, Poscoliero spent time playing in Italy’s lower tiers between the ages of 17 and 22 with San Dońa Calcio and Bassano Calcio. Afterwards, Poscoliero returned to Australia where he played with the Blacktown City Demons in the Playstation 4 NPL NSW competition, before catching the eye of the Mariners.