Mike Mulvey has made his fourth signing in the space of a week for Central Coast Mariners, by bringing in defender Jonathan Aspropotamitis.
The Gosford club are rebuilding quickly under new head coach Mulvey, who won the A-League double with Brisbane Roar in 2013-14.
The Manchester-born coach looks to have made defence his priority in the off-season, with Aspropotamitis following Jack Clisby in signing a one-year deal.
He has already handed one-year contract extensions to left-back Antony Golec and central defender Kye Rowles.
The Mariners picked up the wooden spoon last season, winning just four of their 27 games, while they saw veteran Joshua Rose retire at the end of the campaign and parted company with defenders Liam Rose and Storm Roux.
Aspropotamitis broke into the A-League with Western Sydney in 2015 and played 43 games for Wanderers.
The former Australia U-23 captain said he was thrilled to be joining Central Coast.
Speaking of Mulvey, he added: "When I first met with Mike, I was really inspired by his vision for the club and where he wants the club to be. That persuaded me to move up to the Mariners, and I simply can't wait to get going."
Mariners CEO Shaun Mielekamp welcomed the 21-year-old to the Gosford club, saying: "Jonathan will not only dramatically bolster our defensive capabilities, he will be another strong leader off the field and a great ambassador for us in the community."
Central Coast saw nine players depart at the end of last season and Aspropotamitis is their fourth new arrival - they have also brought in forwards Corey Gameiro and Matt Simon.
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