He tells Australian newspaper The Herald Sun, "This is the end (of the trilogy), but whether one of the characters or a couple of the characters continue on, it's a possibility.
"Certainly, in a moment at the end of the film there is a hope that something else might happen."
He adds, "Inevitably they may think about it, but Johnny may say, 'Pah, I've burnt out Jack. I couldn't go there again.' Or he may not.
"I certainly know he wouldn't say, 'Hey, treble my fee and I'll do it.'"
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