The Script frontman has also defended himself from claims that he's not 'known' enough to be on the panel.
In an interview with Look>/em> magazine, the singer said viewers shouldn't "mistake youth for inexperience."
He explained: "Everything I've worked for in the last 15 years has put me in a position where I don't feel scared."
And the Irish performer joked: "Tom was 40 when I was born and I remind him of that at every opportunity. Then he reminds me of the 40 million more records he's sold!"
The Voice UK continues this Saturday night on BBC One.