"It's always been my dream to play in Serie A and I couldn't be happier," Antonis told SBS.
"It's a fantastic set up over here and a huge opportunity for me to further my career.
"To be joining the same club that Vince Grella and Mark Bresciano played for is a privilege. I hope I can taste some of the success they enjoyed in Italy.
"It's a club with great tradition and hopefully I can take my game to another level here and add to my football education.