According to outlets in the US, the High School Musical heartthrob slipped on a patch of water outside his home in Los Angeles over the weekend, injuring his jaw.
A source told People the 26-year-old needed his mouth wired shut after the incident and also received stitches for a cut to his head.
His rep hasn't commented on the reports yet.
It's thought Zac's injury will mean promotion on his latest project, That Awkward Moment, will be postponed, allowing him time to recover.
That Awkward Moment is about three best friends who make a deal to stay single after plenty of relationship disasters only, of course, to then all start falling in love.
Zac fans will be pleased to know he strips down in the movie. "There was like a sock thing," he explained at a press conference earlier this year. "It fell off. You just cup your hands."
Watch a trailer for Awkward Moment below:
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