The singer, who was confirmed for the BBC show earlier this week, told Free Radio that he's "incredibly excited and incredibly nervous".
Explaining how the producers "have been kind enough to ask [him] for the last three years", Andre admitted that he thought his window of opportunity had come and gone.
"I remember the last year when they asked, we couldn't do it because we still had the reality show and these sorts of things we were committed to, and you need a certain amount of hours a week to film, etc," he said.
"So I said to [manager] Claire, 'They're not gonna ask me next year, they won't'. I said, 'The show's too big now, it's become the biggest show on TV and they don't need to ask anyone,