The former MONTY PYTHON star was "enthusiastic" and "excited" about making HARRY POTTER AND THE SORCERER'S STONE and HARRY POTTER AND THE GOBLET OF FIRE before losing out to US director Chris Columbus.
And Gilliam has now declared Harry Potter producers have missed their opportunity to hire him and shouldn't bother asking him again.
He says, "They've blown it. It's dull and old hat now. It's soiled and sullied.
"I'm basically a jobbing salesman. I'm not sure what my next job will be but you can safely say it won't be a Harry Potter."