The Westmeath singer took a break from the show a couple of years ago.
Mullingar's Niall Horan is set to return as a judge on The Voice US.
It's the third time the Westmeath has appeared on the show.
He coached contestants to back-to-back wins in Seasons 23 and 24.
The former One Direction singer took a break from the show to work on his world tour.
He also revealed recently that he's back in the studio writing a new album.
He will be joined on the panel by Michael Bublé, Reba McIntire and Snoop Dog.
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