With injuries to Shane Lowry and Alex Grant plaguing the Perth defence this season, Poscoliero is a welcome addition who can play in a variety of roles across the backline and can also operate in midfield.
The 27-year-old has spent a large portion of his professional career plying his trade in the Italian lower tier with Veneto-based side San Dona and Serie C outfit Bassano Virtus between 2010-2013.
The versatile defender then returned home to New South Wales to compete with NSW National Premier League (NPL) side Blacktown City, where he made 35 appearances in a standout season that saw the club claim 2014 NPL title and Waratah Cup.
His impressive form for Blacktown earned the Wollongong-born player another pro contract at the Mariners where he played 47 times for the Hyundai A-League side.
Poscoliero endured a tough season for the Mariners this season, missing a majority of matches with a quad complaint and glandular fever; he appeared in just 9 matches for the Gosford-based outfit. He returned in round 17 in a 2-0 victory against Perth Glory in Gosford, and from there the Mariners only conceded 8 goals in their next 7 games with Poscoliero at the back, including two clean sheets.
After a journeyed career through Italy and New South Wales, it's certain that Season 13 of the Hyundai A-League will be a big year for Jacob Poscoliero.