Proposed series Ripper - first mooted as early as 2001 - would follow Giles (Anthony Head) as he battles the paranormal in England.
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© Rex Features / BDG
"You could make that now, or you could make it ten years from now," Whedon told The A.V. Club.
"I've tortured Tony more than any other living human with [promises of] 'We're definitely gonna do this!', because I thought we were."
Whedon added that 58-year-old Head is "still right" for the show and "could still bring it".
"That's the thing with Ripper - it doesn't go away in my head," he admitted.
The Avengers director also confirmed that the BBC had approached him about making Ripper as an original series.
He explained: "The BBC came to me at one point, like, 'It doesn't have to be Ripper, it can just be [Anthony Head], and there's magic'.
"That story was always about a mature guy who's lived, and about the choices he's made."
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Watch Joss Whedon discuss the proposed Buffy remake with Digital Spy below:
