British actor Benedict Cumberbatch said he and Martin Freeman are set to star in a fourth season of their hit drama series "Sherlock."

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"We've agreed to two more [seasons,] but I could get into trouble for saying that," Cumberbatch told Radio Times.

"All I know at the moment is we're doing these three [TV movie-length episodes for Season 3] and another three. I just don't know what there is beyond that. ... It just depends on Martin and [my] availability, how long we can keep it going. It depends on Steven's ability. I'd love to keep it going."

"Sherlock" showrunner Steven Moffat is also the lead writer-producer on "Doctor Who."

Production on Season 3 of "Sherlock" is to begin Monday. It is expected to air this year.

Cumberbatch and Freeman are both starring in popular film franchises. Cumberbatch will soon be seen in "Star Trek: Into Darkness" and Freeman is the star of Peter Jackson's "The Hobbit" trilogy.