The actor addressed rumors that he'd be reprising his role of The Master after his name appeared on IMDb's cast list for upcoming Doctor Who episodes.
"In reply to many, regardless of what it says on imdb, No i'm not returning to Dr Who. Got absolutely no plans to do so #hopethatclearsitup," Simm tweeted on Monday (April 23).
Simm first appeared as The Doctor's mortal enemy in the three-part third series finale, later returning for David Tennant's final episodes in 2010.
He spoke of an interest in returning to Doctor Who last summer, when he told The One Show: "I haven't spoke to anyone about it, but I would definitely consider it [if asked]. It was such fun to do."
Sherlock actor Benedict Cumberbatch has recently been linked to the role of The Master, but current Doctor Matt Smith dismissed those rumors in February.
"I know Ben and I've not heard anything about it. But he's a wonderful actor and a mate," Smith commented.
Torchwood star John Barrowman recently revealed that he shared his desire to return to Doctor Who in a chat with Smitth, adding that showrunner Steven Moffat "thought it would be a great idea".
Doctor Who will return to BBC One and BBC America in the autumn.
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Watch the Doctor Who series seven trailer below: