By FOX Sports staff
The club confirmed on their official website on Thursday afternoon that a one-year deal had been struck that sees the 24-year-old move to the Hindmarsh Stadium until the end of the 2013/14 season.
The signing of Zullo, who is equally adept playing as a left-back or left winger, is a real boost for the Reds as it comes just days after playmaker Dario Vidosic left to club to join Swiss side Sion.
Adelaide coach Josep Gombau, who is preparing for his first season at the helm of the club, was said to be looking for a left-sided player and moved quickly once they were aware the ex-Brisbane Roar man was on the market.
"From the moment we first found out Michael could be available we moved quickly," general manager Michael Petrillo said on the club's official website.
"Michael is exactly the type of left sided player we were after. As soon as Josep had the details and saw the vision provided he was positive that Michael was exactly what we needed in that role.
"He's quick, technically very good, can get forward and has a great engine. We are also sure that he will adapt quickly given his playing experience at FC Utrecht and previously at Brisbane Roar."
Petrillo also revealed that Zullo had been keen on joining the club and thanked Utrecht for ensuring negotiations went as smooth as possible.
"He will add more balance to the squad," he added. "And in our discussions with him, he has been extremely enthusiastic about joining us.
"I'd like to thank the management at FC Utrecht for their professional and cooperative approach to enable the negotiations to conclude so quickly and positively. They have been a great club to deal with."
And with a real chance to play regular first-team football at Adelaide, Zullo admits he is hoping to convince Australi coach Holger Osieck that he deserves a spot in the Socceroos squad for next summer's FIFA World Cup in Brazil.
"I want to be at a club again where I could be a first eleven player and play regular football," he explained.
"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.
"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.
Zullo broke onto the scene at Brisbane in 2007 and his stunning displays alongside Robbie Kruse, who now plied his trade for Bundesliga outfit Bayer Leverkusen, earned both of them moves to Europe.