Born in Bankstown, the 23-year old will return to the Hyundai A-League after spending the last 18 months in the Greek Super League with PAOK and most recently on loan at Veria FC.
Capped at all levels of the national team, including three times for the Socceroos, Antonis spent five seasons with Sydney FC from 2010-2015, making 69 appearances in the Hyundai A-League.
The midfielder arrives in Sydney tonight and will be available for selection come Round 14 of the Hyundai A-League.
Sydney FC (2010-2015)
Veria FC (2015-16), on loan
NRMA Insurance Western Sydney Wanderers Hyundai A-League 2016/17 squad:
Goalkeepers: Vedran Janjetovic, Andrew Redmayne, Jerrad Tyson
Defenders: Jonathan Aspropotamitis, Aritz Borda, Jack Clisby, Shannon Cole, Robert Cornthwaite, Brendan Hamill, Scott Neville
Midfielders: Terry Antonis, Kearyn Baccus, Mitch Nichols, Dimas Delgado, Steven Lustica, Nico Martinez, Jacob Melling, Bruno Piñatares, Mario Shabow
Attackers: Brendon Santalab, Jaushua Sotirio, Lachlan Scott, Jumpei Kusukami
Scholarship Players: Jackson Bandiera, Liam Youlley, Emilio Martinez