"Any actor would love the challenge," the Survivors star told BBC News, responding to the frequent speculation that he will replace the departing David Tennant as the iconic Time Lord.
Joseph, who also starred in Steven Moffat's Jekyll, refused to confirm or deny whether any negotiations are underway. Referring to his current status as a bookmakers' favourite for the role at 3-1 he said: "I'm afraid I can't make any comment on it. I'm not a gambler, and I don't approve of gambling unless it's for the Grand National."
However, he did explain his feelings on the longevity of the legendary character: "[The Doctor's] parameters are so vast. I don't see why he can't have more regenerations than the 13 that those who know think a Time Lord can have."
> Click here for our look at the contenders in the race to be the bext Doctor