Los Angeles: Music mogul Simon Cowell and Cheryl Cole are reportedly set to quit the British version of talent hunt show `The X-Factor` to concentrate on the American one.
And the network is concerned about the departure of the duo, reports aceshowbiz.com.
"There will be massive shake-up. Simon is a huge, huge loss. He gives the judging panel such authority and there are big fears that millions will switch off without him. And two million extra viewers tuned in when Cheryl joined the panel. To lose her as well is a nightmare," a source told News of the World.