Asked if she would still fancy joining the show and following in fellow radio DJ Nick Grimshaw's footsteps, Sara told HuffPost UK: "I think that boat has sailed a bit because I was up for it the same time as Mel B and that was a couple of series ago now.
"Also being friends with Grimmy, I feel like I have almost half done it because I heard lots from him, I watched him, and I was really proud of him."
She continued: "I feel like I've done a lot of judging from my sofa, so that's fine.
"I don't think they'd ask me now, but it was definitely exciting to be in the running," she added.
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Sara is close friends with former 'X Factor' judge Nick Grimshaw
Michael Leckie via Getty Images
Grimmy has already announced his departure from 'The X Factor', after just one series as a judge, with Louis Walsh rumoured to be returning to his old seat.
The original line-up: Sharon Osbourne, Simon Cowell and Louis Walsh (credit:ITV)
Series 4 (2007)(02 of11)
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All change: Dannii Minogue joins Simon Cowell and Sharon Osbourne, with Brian Freidman replacing Louis Walsh.Dermot O'Leary also replaces Kate Thornton as the show's host.
Series 4 (2007)(03 of11)
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The return of the Walsh: Louis makes a comeback after Brian Freidman is axed from the panel after only a few days of auditions.
Series 5-7 (2008-2010)(04 of11)
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The golden era: Cheryl Cole replaces Sharon Osbourne, joining Simon, Dannii and Louis.
Series 8 (2011)(05 of11)
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A mass exodus: Gary Barlow, Tulisa and Kelly Rowland join the only original remaining judge, Louis Walsh.
Series 9 (2012)(06 of11)
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Schermazing: Nicole Sherzinger replaces Kelly Rowland, joining Gary, Tulisa and Louis.
Series 10 (2013)(07 of11)
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She's BACK! Sharon Osbourne rejoins the panel after five years, replacing Tulisa and joining Louis, Gary and Nicole. (credit:Rex)
Series 11 (2014)(08 of11)
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REUNITED: Simon and Cheryl return alongside Louis Walsh and new judge Mel B. (credit:Syco/Thames/ITV)
Series 12 (2015)(09 of11)
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Bye bye Louis: Nick Grimshaw and Rita Ora replace Louis and Mel, as they join Simon and Cheryl on the panel. Meanwhile, Caroline Flack and Olly Murs step into Dermot's shoes as hosts. (credit:Twitter)
Series 13-14 (2016-17)(10 of11)
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A vintage line-up: Nicole, Louis and Sharon all stage sensational returns to the panel after the departures of Cheryl, Nick and Rita, while Dermot also returns as host. (credit:ITV)
Series 15 (2018)(11 of11)
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WTF?! Louis Tomlinson becomes the first former contestant to join the panel permanently, while Robbie joins the panel alongside his wife and 'Loose Women' panellist Ayda Field. (credit:Doug Peters/EMPICS Entertainment)