The Girls Aloud singer and professional dancer Derek have been inseparable since she recovered from a life-threatening bout of malaria and she wanted him as a mentor for the judges’ houses section of the show.
According to the Sunday Mirror, executive producer Richard Holloway was far from impressed with the idea.
An X Factor source said: “This is the biggest show on TV so he feels that, likewise, mentors should be the biggest names in the music industry, not the judge’s latest squeeze. It’s unprofessional to say the least.
“Cheryl may adore Derek but unfortunately that feeling isn’t shared among The X Factor bigwigs.”
Producers have apparently now lined up Black Eyed Peas star Will.i.am to work with Cheryl’s acts.
Cheryl and Will.i.am are friends after he produced some of the tracks on her debut solo album and she supported Black Eyed Peas on their European tour.
The multi-talented star was said to have fallen for Cheryl during the tour, only to lose out to Derek.