After impressing Simon Cowell with her rendition of Jessie J's 'Bang Bang' at Judges' Houses, Fleur has been labelled one to watch by the judging panel.
And now, Brian has claimed he thinks the 26-year-old will go on to be a "stand out star".
Speaking to the Mail Online, Brian admitted he thinks Fleur has what it takes to be a musical success across the pond in the States.
He said: "Fleur is a stand out star. She is at that level and I could see her making it in America."
Mentored by Simon Cowell, Brian claimed Fleur would make it to the final of the talent competition and he said he wouldn't be surprised if one of the music mogul's four acts took home the X Factor title.
"[Simon] has a good chance of winning," he added. "Someone like Ben Haenow, he could definitely make the final. Andrea [Faustini] is a shoo-in for the final and Fleur.
"If I could call my top four it would be Fleur, Ben, Andrea and Only The Young."
While Simon still has all four of his acts - Ben, Fleur, Jay James and Stevi Ritchie - in the competition, Louis has two remaining groups - Stereo Kicks and Only The Young - and both Mel B and Cheryl Fernandez-Versini have just one hopeful left.
Last weekend, Mel was the latest judge to suffer a blow as her act Paul Akister was voted out in a shock exit.
Finding himself in the bottom two alongside Jay, Paul was sent home after the judges' vote was left to deadlock and missed out on a spot on the X Factor tour.
But since his exit, fans have been given hope he may be re-added to the tour line-up.
Following a cryptic tweet from the show's executive producer suggesting he would "make something happen", fans have called for Paul to be brought back.
And, one person who is keen for it to happen is Xtra Factor host Sarah-Jane Crawford.
Speaking exclusively to Reveal, Sarah-Jane admitted Paul was one of her favourites on the show and she would love to see him join the tour.
She said: "I really hope it happens for Paul. I've heard the same [rumours] in the building and I'm like 'Guys! We have to do it!'.
Hmm, maybe we should watch this space!
The X Factor continues this Saturday and Sunday (15-16 November) at 8pm on ITV.
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Watch Fleur perform Michael Jackson's 'Will You Be There' here: