The 2010 winner told Digital Spy that he likes the concept of competitors performing their own songs, but warned that it could have a negative effect on their chances when going into the live finals.
"I think it's good to go in with your own material, but I also think that it's very dangerous - if your song has charted before you've even got through," McElderry said.
"But then again, if you don't get through Boot Camp but your song's charted, you've had the platform. From an ex-contestant's point of view I suppose it would be good, but I think it could affect the way people look at you in the live finals."
He added: "It psychologically messes with people's minds as they'll think, 'Oh they're safe', or, 'They're not'. From a voting side of things it could ruin it a bit and take the surprise element away."
Joe McElderry's fourth studio album Here's What I Believe is available to buy now.
Watch the video for McElderry's single 'Here's What I Believe' below: