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Rex Features
The caution comes a day after co-star Kim Cattrall reportedly told Mel B on The Paul O’Grady Show that a follow-up is definitely on its way.
In a statement to Access Hollywood, Parker said: "I'm thrilled to know Kim is excited but all the deals are not yet done.
"With 'the wind on our heels', we hope to make it a reality."
The first film, which was released in May, took more than £211 million worldwide.
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