Robbie Williams is called in to be a guest judge on the X Factor along with rocker Rod Stewart

Let Me Entertain you: Robbie Williams is called in to be a guest judge on the X Factor along with rocker Rod Stewart

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UPDATED:

15:46 GMT, 19 May 2012

His fellow band mate may already be head judge on the X Factor panels, but fans of Take That can now look forward to seeing another familiar face on the show.

Robbie Williams has been asked to complete the judging line-up at the last minute meaning he will join Gary Barlow on the talent show.

However, the 38-year-old isn't the only singer who's been appraoched as Rod Stewart has also been signed up.

Getting ready to judge: Robbie Williams and Rod Stewart have been asked to join the panel on this year's X Factor as guest judges

Getting ready to judge: Robbie Williams and Rod Stewart have been asked to join the panel on this year's X Factor as guest judges

Getting ready to judge: Robbie Williams and Rod Stewart have been asked to join the panel on this year's X Factor as guest judges

The sudden decision by TV bosses comes after former judge Dannii Minogue refused to return to the show following hours of negotiations.

Robbie adn Rod will now take turns to fill the gap and sit alongside Gary, Louis Walsh and Tulisa Contostavlos when the show starts next month.

According to the Daily Star, producers were said to be worried that they would have had to go ahead with auditions in Liverpool without the presence of a fourth judge.

Regular on the show: Robbie helped out band mate and X Factor judge last year when he was mentoring his group

Regular on the show: Robbie helped out band mate and X Factor judge last year when he was mentoring his group

However, Robbie's place on the panel is not intended to be a permanent thing, but instead he will be seen as a guest judge.

'There is always a buzz in the air when Robbie and Gary get together. This could save us,' a show insider told the newspaper.

'Obviously we love Gary, Tulisa and Louis but we wanted to kick off next week with a bang and get everyone talking.'

Robbie has already made his debut on the ITV show after he performed with runner-up Olly Murs in 2009, and helped Gary mentor his group of boys in last year's series.

New colleagues: Robbie will join Gary as well as Tulisa Contostavlos and Louis Walsh on the judging panel

New colleagues: Robbie will join Gary as well as Tulisa Contostavlos and Louis Walsh on the judging panel

New colleagues: Robbie and Rod will join Gary as well as Tulisa Contostavlos and Louis Walsh on the judging panel ion here

The show's executive, Simon Cowell, is said to have been really worried about the line-up after former pop star Dannii said no to the offer.

The Australian star allegedly demanded 5million for her return to the show, and was obviously annoyed with the music mogul after he revealed earlier this year that they had a fling a few years ago.

'Having Dannii back would have been huge,' the insider continued.

'But that’s fallen through so hopefully Robbie will join us and create the excitement we need to launch the series.'

Not coming back: Danni Minogue refused to return to the X Factor for anything less than 5million

Not coming back: Danni Minogue refused to return to the X Factor for anything less than 5million

It is unknown whether or not the Rock DJ singer has said yes to the job yet, but no doubt he will be considering the fact that he is a married man now who resides in Los Angeles with his pregnant wife Ayda Field.

However, according to the Daily Mirror, Rod is finalising details for his appearance on the show and will join the panel in the next few days when auditions begin.

'Rod is a genuine living legend and exactly what the show needs,' a source told the newspaper.

Another star who's said yes to working with Simon is Britney Spears.

But the 52-year-old is already receiving negative opinions on his decision to invite Britney to be a host on the U.S. version of X Factor.

'Britney is the biggest gamble of Simon’s career,' a TV source said.

'Biggest gamble': Britney Spears as joined the U.S. judging panel along with Demi Lovato

'Biggest gamble': Britney Spears as joined the U.S. judging panel along with Demi Lovato