Cartoonist Dean Haspiel mentioned in his report on the Creative Arts Primetime Emmy Awards ceremony that Castle and The Spirit star Stana Katic claimed to be in talks to appear in the film.
Ellis responded to the rumour on his website. "I don’t own The Authority and DC are certainly not compelled to tell me about anything regarding the book," he wrote.
"What an odd thing."
No more details have emerged of the possible project.
WildStorm's The Authority enjoyed popular runs from Ellis and Hitch followed by Mark Millar and Frank Quitely from its debut in 1999, but disagreements with new WildStorm owners DC plagued Millar's run and the series has never reproduced that early success since.