The 36-year-old said that he would love for the series to continue for “as long as possible” as he picked up the television drama prize for Parade’s End at the South Bank Sky Arts Awards.
"We've agreed to two more series but I could get into trouble for saying that," he told radiotimes.com.
"All I know at the moment is I'm doing these three [episodes of the upcoming series] and another three."
And although keen to carry on with more episodes beyond the next run, Cumberbatch did admit that the show’s future did depend on the availability of not only himself and The Hobbit star, but writer Steven Moffat too.
"We love doing it as we are doing it at the moment in the format we are doing it," he said.
"I'd love to keep it going for as long as possible, I think we all would."
READ MORE: http://www.mirror.co.uk/tv/tv-news/sherlock-benedict-cumberbatch-confirms-fourth-1759185