The judge, who is scheduled to perform her debut solo single 'Fight For This Love' on Sunday night, confirmed that she will pre-record her performance with a live vocal earlier in the day.
"I really don't see the problem. I will be singing live," The Evening Standard quotes her as saying.
"I just won't have time to get changed and get prepared for the performance, and be a judge on the show. It would be too hectic."
Cole, who performed 'The Promise' with Girls Aloud last year on the show, admitted that she feels "absolutely terrified" about singing by herself.
"I love performing but I've sat for weeks judging people and now I'm putting myself out there to be judged," she said.
Whitney Houston is also confirmed to perform on Sunday's live show, which is broadcast on ITV1 from 7.45pm.