Martin Freeman has teased Sherlock fans that the show's creators have come up with a "mouth-watering idea" for a one-off special.
But The Hobbit star told Alan Carr on Channel 4's Chatty Man that fans will have to wait some time before he and Benedict Cumberbatch return as Dr Watson and Sherlock in the hit BBC show, as they and writers Steven Moffat and Mark Gatiss are all to busy to start work on the next instalment.
Martin revealed: "Steven and Mark have a great idea for something we could do next which they told Ben and I. It's a fantastic, really mouth-watering idea.
"I don't know what it's going to involve apart from this one central idea... now Mark Gatiss may beat me up now... 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."
But the Fargo actor admitted: "I really don't know when we are going to get to do it. I'm up for it - I'm ready - but it's getting planes to land in order, we just all need to be ready at the same time.
"We are all very busy. So in all honesty, and I'm not being cute here, I don't know. I really really don't know... I'm not even being coy. I just don't know when it's going to happen."
:: Alan Carr Chatty Man airs on Friday nights at 10pm on Channel 4.