Emma Bunton, Mel C and Geri Halliwell are all set to return, but when asked on whether David Beckham's wife would be joining them, Mel B replied: "Well, we'll see about that one."
Mel revealed that the successful fashion designer might join the group on a few select shows.
If the girls finally do decide to fill arenas once more, it will be their first tour since their 2007 Viva Forever reunion.
The band last performed together at the opening ceremonies of the London Olympics in 2012.
Since then Posh Spice has repeatedly shot down reports that the popular group would be reuniting.
"I'm not going on tour," Victoria told Vogue earlier this year. "What does that look like in the future? It's not me in a catsuit."
In contrast, Mel B is wildly enthusiastically about her old costumes, having built a shrine in her bedroom to honour her Spice Girls days.
"I couldn't leave all my Spice Girls clothing in a box," she said on the show.
"It sounds real self-involved, but I'm actually real proud of what us five girls accomplished.
"So I've got it in my bedroom in the corner. When my friends come over we play dress up."
