According to reports, the dancer is going to appear on Simon Cowell's revamped series in a boyband formed with his pal Jeremy.
Brendan, 43, and the Holby City star, 48, apparently first formed the duo as a novelty but things have been going rather well.
It's a bold move for Brendan to move to Strictly's rival show on ITV. It comes after he was let go by Strictly bosses in 2018.
A source told the Sun Online: "Brendan has a huge fanbase from Strictly, and Jeremy has been on some of the biggest soaps in the country so they're hopeful they will go far.
"Initially it started out as a bit of a novelty idea but they're really enjoying it and have started to feel pretty optimistic about making a mark on the show."
The insider continued: "They've already filmed their first scenes, so there's no going back — but Strictly probably won't be too impressed when they find out he has jumped on board with their biggest rival after all those years."
Ent Daily has contacted a representative for Brendan for comment.
Initially it started out as a bit of a novelty idea but they're really enjoying it and have started to feel pretty optimistic about making a mark on the show.
Brendan and Jeremy, who starred on Hollyoaks and Holby City, will be up against other famous faces for the new show.
TOWIE's Gemma Collins, Corrie's Lucy Fallon and footballer-turned-actor Vinnie Jones are also rumoured to be taking part.
The X Factor spin-off comes as Simon wants to give the long-running show a reboot. The music boss is also planning an all-star version of the show, which would see X Factor alumni return to the stage and fight for the winner's title.
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