The director said at the London Film and Comic Con that a sequel to his Judge Dredd film will be made if the first takes enough money in the US, reports Bleeding Cool.
"We'll see a sequel if the gross is above $50 million (£32 million) in the US," said Garland. "It's a simple financial equation. We're an independent movie."
He explained that he had formerly planned to include Judge Death and his fellow Dark Judges in the film, but was forced to reject the idea "after about 16 drafts".
"I needed to have set up the city and Dredd first before taking on what is essentially a riff on the Judges," he said. "You need to know what the Judges are before you can subvert them.
"I wrote a second script which was about Dredd going out to the Cursed Earth. That was rejected for similar reasons.
"If they want to make sequels, I've got a story that goes from this one into the origins of Dredd and the city. Then the third one would have a strange, existential attack from the Dark Judges."
Dredd stars Karl Urban, Lena Headey and Olivia Thirlby. It will debut in cinemas on September 21.
Watch a trailer for Dredd below: