Hopefuls MK1 were told on Sunday's show (September 8) that they should lose singer Will Baker from their lineup.
However, it has emerged that Baker is friends with MC Ultra, the man who leaked Tulisa's sex tape earlier this year.
"Justin has been booked into Will's studio to record over the next few weeks," a source told The Mirror.
"Tulisa wouldn't have known about it at the time of X Factor filming."
MK1 performed Professor Green's 'Read All About It' on Sunday's episode of The X Factor, with Tulisa criticising Baker's performance.
She said: "The good news is, that's rap. The bad news is you're either going to have to become a duo, or get a new member.
"I need to understand what [Will's] involvement is in the band. I'm trying to listen to Charlie sing, but I keep hearing you wailing. It was agitating me, I wanted to enjoy the song and it was just stopping me from doing that."
MC Ultra - real name Justin Edwards - tweeted during the show and started a 'Bring Will Back' campaign.
Baker replied: "Big up @officialultra currently producing a massive record with him."
Edwards's boss recently said that releasing the sex tape online was "career suicide".