All four of the original Ghostbusters - Aykroyd, Bill Murray, Harold Ramis and Ernie Hudson - were said to have signed up to star in a third film, 21 years after the second installment hit cinemas in 1989.
Murray previously dismissed the speculation, insisting plans for a follow-up are "hogwash".
But now Aykroyd has spoken out to insist the script is near completion - and he's convinced even Murray will be pleased with it.
He tells Britain's Daily Express, "I think Bill was concerned that the writing on Ghostbusters 3 would not be up to standard but I'm working on the script now and Bill has the comic role of a lifetime."
But Aykroyd concedes this could be the last film in the franchise for the original line-up: "My character's eyesight is shot, I've got a bad knee, a bad hip - I can't lift the Psychotron Accelerator any more. We need young legs, new minds, new Ghostbusters".