The top-drawer cast for Sherlock series four has hired another familiar face, with Sacha Dhawan signing up.

Dhawan will play a character named AJ in the new series, according to his online CV with Troika Talent.

He joins series regulars Benedict Cumberbatch, Martin Freeman, Amanda Abbington, Rupert Graves and Louise Brealey - plus fellow guest Toby Jones, cast as "one of Conan Doyle's finest villains".

BBC America BBC

Dhawan previously collaborated with Sherlock co-creator Mark Gatiss (who also plays Mycroft) in 2013, on BBC Two's Doctor Who origins drama An Adventure in Time and Space.

The pair re-teamed later that year for the channel's one-off horror The Tractate Middoth, while Dwahan has also appeared in BBC One's In the Club, ITV's Mr Selfridge and Channel 4's Not Safe For Work.

FameFlynet

Sherlock is currently shooting three new episodes, expected to air on BBC One in early 2017.

But will this be the final series? Gatiss has hinted that the story of Sherlock (Cumberbatch) and John (Freeman) may be "about to reach its climax".

"Ghosts of the past are rising in the lives of Sherlock Holmes and John Watson - bringing adventure, romance and terror in their wake," he promised.

Sherlock season 4: Trailer, cast, release date, spoilers and everything else you need to know

Who's nicer - Sherlock or Mycroft? Watch Sherlock writers Steven Moffat and Mark Gatiss debate the Holmes brothers:

This content is created and maintained by a third party, and imported onto this page to help users provide their email addresses. You may be able to find more information about this and similar content at piano.io