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The actor has long talked about the possibility of a spin-off movie and creator Neil Cross confirmed in October that more Luther was on the way.
Now, 48-year-old Elba has revealed that filming will get under way this year.
Appearing on The All-New Capital Weekender, he was asked about his plans for 2021.
The actor, producer and DJ replied: "Definitely making more music, people that love my film and stuff, listen, I'm going to be making Luther - the movie.
"I'm super excited and I hope the fans are sort of excited for that.
"It's been a long time coming for a movie, for people that have loved the show. We've been making the show for 10 years, so we're making a film."
Creator Cross has previously kept his cards close to his chest when asked about the prospect of a film.
Speaking to Radio Times, he said: "Ask Idris! We are - I don't know what I'm allowed to say, which is an answer in of itself! Words are my job and I've lost them all.
"We wanna make more Luther. We're gonna make more Luther. The how and the why, that's all to come, but we're gonna make more Luther."
Elba has voiced his eagerness to take the detective to the big screen for years now.
Speaking last year, he said: "I've maintained that I'd like to see [Luther] come to a film. That's what I think we're headed towards, is a film. I'm looking forward to making that happen... It is happening!
"With film, the sky is the limit. You can be a little bit more bold with the storylines, and a little bit more international, and a little more up the scale. But John Luther is always going to be John Luther."
Back in 2018, the actor said Cross was working hard to get the project off the ground.
"We are really advancing on getting a movie version up on the screen," he said.
"Neil is beavering away on writing this thing, and I think the remit for the film is to scale it up.
"It will be more murder, more Volvos, more frowning Luther... essentially we just want to try to take it to a much bigger audience and scale, and perhaps international as well."
LADbible has contacted the BBC for comment.
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