The 24-year old left-back, who can also be deployed in midfield, has joined the Reds from Dutch club FC Utrecht on a season-long loan and is eyeing plenty of game time as he strives to force his way into Australia's World Cup squad.
"I want to be at a club again where I could be a first eleven player and play regular football. Obviously with an eye on the World Cup next year as well, I want to try and get as many games under my belt this season as I can and push a case to be part of the Socceroos," Zullo said.
"Luckily enough Adelaide United showed some really keen interest on getting me, I got a really good vibe from the people I've talked to at the club, and I'm just really excited about getting there.
"On the field I think I can bring some energy and speed down the left hand side, so hopefully I can help Adelaide and I think the game style they intend to play is a perfect fit for my kind of game and hopefully it will be a good fit for both of us."