Earlier today, Nick confirmed he has quit the X Factor after just one series, and already, the floodgates are wide open when it comes to speculating who could take his place.
Not surprisingly, Louis' name has cropped up and rumour has it Simon Cowell is keen to get the One Direction star to join him on the judging panel.
Last series, Louis joined Simon as a guest mentor on the show, proving he already knows how to give his thoughts on the show's aspiring singers.
He was a hit with the contestants and fans, and now Simon is hoping Louis will upgrade his X Factor cameo for a permanent position.
A source revealed to The Sun: "Louis Tomlinson is very likely to replace Grimmy. He agreed in principle to the job while assisting Simon Cowell during the judges' houses round last year."
However, it sounds like he could have competition.
Ex-judge Louis Walsh is also being considered, after Simon felt there was "something missing" on The X Factor last time round.
The source added: "Simon remains very fond of Louis Walsh and came very close to bringing him back during last year's live shows. He felt a certain something was missing on the show without him."
After appearing on the show for eleven years running, Louis finally hung up his boots last year.
While the Irish music mogul admitted he was "cracking up a bit" towards the end of his time on The X Factor, he didn't rule out a return and hinted Simon would have something lined up for him in 2016.
He explained he was hoping to take part in I'm A Celebrity, but was advised not to by Simon who revealed he had something up his sleeve for his old pal.
Speculation surrounding the X Factor judging panel comes after Grimmy recently announced his exit.
A rep for the Radio 1 DJ confirmed his exit: "After careful consideration, Nick's decided to rule himself out as a judge on this year's X Factor. He loved working on last year's series alongside Rita, Cheryl and Simon but it was very much a once-in-a-lifetime experience."
Nick has since opened up about his decision to leave, he said: "When I finished at Christmas and had time off and had a think about it and sat down, I just thought, it's one of those things I loved – it isn't a diss to the show or me storming out of X Factor like 'Screw you Cheryl!' It's a great show and I loved it but it's a once-in-a-lifetime style thing."
"I genuinely loved it," he insisted. "There is no bad blood. I just want to watch it on the telly."
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