Antonis is on the brink of a long-coveted move to European football, one which was snatched from his grasp two years ago, when Parma pulled out of a deal after the midfielder suffered a debilitating quadriceps injury.
However, Antonis's time has come again, and it seems his exit from the Sky Blues is imminent.
It is believed Antonis, 21, will join Greek top flight side PAOK, who finished fifth last season.
PAOK's coach is former Croatia international Igor Tudor, who himself had a distinguished career playing as a defender.
Sydney FC CEO Tony Pignata refused to comment on the likelihood of Antonis departing in the coming days, when contacted by The World Game.
Pignata did, however, deny Antonis, who has a year remaining on his Sky Blues contract, is going to Portuguese top tier outfit SC Braga, with whom he was linked last week.
Antonis has made no secret of his desire to test his talent in Europe and with Sydney FC blessed with surfeit of midfielders, the gifted playmaker, who has three caps for is country and has made 69 competitive appearances for Sydney FC since 2010, appears poised to finally make his move.
Sydney FC have an abundance of options in the centre of the park.
Re-signed player of the year, Milos Dimitrejevic will play deep in midfield, and his fellow Serbian Milos Ninkovic has been pencilled in by Graham Arnold to play as the number 10, which is Antonis's preferred position.
Mickael Tavares's contract was also extended at the end of last season, and he is expected to partner Dimitrejevic and Ninkovic in a powerful-looking midfield trio.
Arnold also signed promising Perth Glory midfielder Brandon O'Neill, who will offer plenty of bite in the centre of the park, while Rhyan Grant is also capable of filling in deep in midfield.
Antonis provided a glimpse of how he might fair on a grander stage when he starred for Sydney FC in their post-season exhibition games against touring English giants Tottenham Hotspur, and Chelsea.
He even caught the eye of Chelsea's coach, Jose Mourinho.
The Portuguese doens't hand out accolades for fun, but he singled out Antonis for special mention, after Chelsea edged out Sydney FC 1-0 at ANZ Stadium.
“(There are) No friendlies. I don’t like the word ‘friendly’,” Mourinho said.
“A match is a match. Of course some are more important than others, but that fellow in midfield (Antonis) that was really aggressive in playing for a result, impressed me.”
