The star of Tim Burton's acclaimed 1989 and 1992 movies said he wanted a Year One-style origin film for the third instalment.
The actor praised director Christopher Nolan, admitting that he had not watched his take on the superhero. He was also complimentary of star Christian Bale.
"The guy who's doing them now, Chris Nolan, he's so talented, it's crazy," he told WTF. "But I say that like I've seen them, and I actually haven't. I didn't even see much of the second one that I did.
"You look at where he went, which is exactly what I wanted to do when I was having meetings about the third one. I said you want to see how this guy started. We've got a chance here to fix whatever we kind of maybe went off. This could be brilliant.
"Didn't want to do it, so I didn't want to do it."
Keaton will feature in 2014's RoboCop remake as Raymond Sellars.
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