The French midfielder joined Mark Hughes' side from Porto for a record £18.3m on transfer deadline day.
"If he is as good as we think he is, he'll keep his value," said Potters chairman Peter Coates. "You've got to think of it from a business point of view. We want him to be worth more than we paid for him."
Stoke are without a win in five league games now and will be hoping Imbula can help them overcome Everton on Saturday afternoon.