Richard Clark, who will helm two episodes of the sci-fi hit later this year, announced on his Twitter account that he would be working on a script written by the Sherlock co-creator.
He said: "In the thick of Dr Who. New drafts coming along. Mark Gatiss story wonderful. (sic)"
Clark previously directed the third series episode 'The Lazarus Experiment', which featured Gatiss in a guest role.
The director later added that he was impressed by the quality of the scripts written by Gatiss and fellow scribe Neil Gaiman.
"Scripts falling into place beautifully. Mark Gatiss/Neil Gaimen - a million thanks."
The sixth series of Doctor Who will premiere in the spring of 2011.