Viva Forever!'s run on the West End could end since many performances have empty seats.
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The Daily Star claims that the theatre show, written by Jennifer Saunders and based on the girl group's songs, is usually only "three-quarters full".
Viva Forever! failed to impress the critics when it debuted last month, with it being described as a "disappointment" and "terrible".
There was further bad press on the launch night after Posh Spice Victoria Beckham turned up late and chose to sit away from her former bandmates.
A spokeswoman for producer Judy Craymer said: "The West End takes a dip this time of year. But the show is doing really well."
Photo gallery - Spice Girls musical launch:
Mel B, Geri Halliwell, Emma Bunton and Mel C at the opening of the Spice Girls musical, Viva Forever!
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Copyright: PA Images Matt Crossick/Empics Entertainment
