London, Dec 14 : Music mogul Simon Cowell is contemplating quitting `X Factor' after the next series.

The X Factor has admitted that it was exhausting to do the show plus `American Idol' and `Britain's Got Talent'.

"It looks like I'm only going to be doing it until 2010. I've really felt it this year. When you do three shows a year it's tiring and something's got to give," News of the World quoted him, as saying.

"I'm contracted to do one more series and then I'll make a decision. I'll see how I feel in the New Year," he added.

He also hinted fellow judge Dannii Minogue may choose to walk after this series-and hailed Cheryl as "this year's real winner".

Rumours have been rife over Simon's clashes with Dannii, with accusations flying that she is jealous of his friendship with new judge Cheryl. (ANI)