The songbird's long-time collaborator, who executive produced her latest album 'Me. I Am Mariah... The Elusive Chanteuse', thinks the record can still ''sell millions'' despite opening to the lowest numbers of Mariah's career.
The album sold just 58,000 copies in its first week of release in the United States, but Jermaine is hopeful it will have a lasting impact.
He told Rap-Up.com: ''I actually feel like it's probably one of her best albums she's ever made.
''I'm excited to see where the album ends up. I tell a lot of people, this era of music and this genre, they don't understand records that come out small and sell a lot of records.''
The music producer went on to suggest that Mariah, 44, will continue as planned by releasing new singles to make the album a success.
He added: ''So, it's like the first-week sales sometimes don't really matter.
''I think people gotta start understanding - if you have a plan and you can put the plan in play, you just gotta keep livin' it out.''