Simon Cowell reportedly does not plan on rejoining The X Factor in the UK.

The TV judge is said to worry that he would always look old and tired due to the jet lag from flying between the UK and the US.

"Simon hates the way his face looks when he's jet-lagged and that's the real reason he will never be back," a source claimed to The Sun.

"When he's tired he gets bags and dark circles under his eyes and he hates that. The air-con on the plane also really dries out his skin. When he gets off a plane, he wears sunglasses to hide his eyes."

The X Factor USA usually airs on Wednesday and Thursdays across the Atlantic, meaning that Cowell could return home for live Saturday shows such as Strictly Come Dancing's Len Goodman and Bruno Tonioli, who also judge the show's ABC counterpart Dancing with the Stars.

The insider added: "Simon's looks are important to him - he's got one of the most famous faces in the world. This is all about him protecting his image."

Cowell was previously alleged in Tom Bower's biography to regularly take botox injections in order to stay looking young.