"Ex Machina" director Alex Garland has revealed the fabled sequel to 2007's "28 Weeks Later" is moving forward, but he won't be writing it.

The filmmaker, who wrote the acclaimed 2002 post-apocalyptic thriller "28 Days Later," teased earlier this year that he, director Danny Boyle and producer Andrew Macdonald had settled on an idea for the third installment, usually referred to as "28 Months Later." However, he now says that's where his involvement will end, with the idea.

“About two years ago, Danny started collaborating on the potential to make ‘Trainspotting 2,’ another sequel,” Garland tells The Playlist. “In that conversation, an idea for '28 Months' arrived. I had a sort of weird idea that popped into my head. Partly because of a trip I'd taken. I had this thought, and I suggested it to Andrew and Danny, but I also said I don't want to work on it. I don't really want to play a role, and Andrew said, 'Leave it to me.' So he's gone off and is working on it.”

Garland, who executive produced but didn't write "28 Weeks Later," elaborates that he's not a fan of sequels: "Sequels are generally done in a rush. It's done with a sense of urgency. The first movie, you spend a long time developing to get it over the line. The second thing, you don't. Your expectations are different and your motivations are different.”