The 26-year-old hunk - who was recently rumoured to be dating 'Neighbours' co-star Halston Sage - has played coy about his relationship status, claiming he isn't actively looking for a girlfriend.
Quizzed if he's off the market now, Zac quipped: "I don't know, I'm not really sure I'm in the market ... I'm not investing. My money's out!"
The hunky star, whose previous romances include 'High School Musical' co-star Vanessa Hudgens and Lily Collins, is thought to have got close to Halston, 20, while they were filming the raunchy new comedy last year.
The stars were spotted looking cosy as they took in a Los Angeles Lakers basketball game earlier this month.
Zac also opened up about his sobriety - after seeking treatment twice last year -exclaiming that he feels "great" and is excited to further his acting career.
He told ITV's 'Good Morning Britain': "[I'm] than ever now. I'm just super excited about the future. This has been a long time coming. When I was a kid, I imagined doing this, but I never thought I'd have a chance. So I'm pinching myself that I'm still around."
In 'Neighbours', Zac plays a college fraternity leader, whose hard-partying ways annoy his next door neighbours, but the star admits the party scenes were less fun than they appear.
He explained: "It was chaos. It was not fun to be on set for a party that goes on that long. We were falling asleep in corners with rave music blasting."