Martin Freeman, who has just finished working on the Hobbit movies and has now moved on to FX’s Fargo, made a comment this week that will certainly make fans of the acclaimed BBC series Sherlock excited. While there are no immediate plans to do a full fourth season, Freeman teased that a special ‘one-off’ episode may be in the works.

While speaking with Chatty Man’s Alan Carr, Freeman said that co-creator Mark Gatiss might not want him to reveal anything, but the idea is there.

“Mark Gatiss may beat me up, but there is an idea for this one-off special that’s such a good idea, and as I was listening to it I thought ‘we’ve just got to do this,’” Freeman said, reports CultBox. “And I don’t know when we are going to be able to do it, unfortunately.”

Freeman added that it is a “mouth-watering idea,” but he isn’t confident that it could happen.

Each series of Sherlock has included just three, 90-minute episodes, but due to the packed schedules of Freeman and Benedict Cumberbatch, they have become increasingly difficult to make. For example, this year’s third season featured the first full-length episodes since season two aired in 2012.

In an interview with The Guardian earlier this month, Freeman said that there was hope they would film this fall, but “apparently that's fallen away.” He added, “We're all busy. But I'm ready. I'm there. It depends if you want to make time for it. I hope we do. I love it.”

Sherlock was created by Gatiss and Steven Moffat. It finds Cumberbatch as a modern-day Sherlock Holmes in London, with Freeman playing John Watson.