The 20-year-old penned a new three-year deal in August after he impressed manager Sven Goran Eriksson - before he joined West Brom.
However, Green has dismissed suggestions that Miller is ready to make a move.
"He is not going anywhere," he told skysports.com.
"He is doing well, but that is just what we expected and what City thought.
"The plan was always for him to go on loan and then return and I don't see how that has changed.
"Ishmael has proved himself and he wants to keep playing well up until the end of the season with West Brom, after that he will return to City.
"He wants the chance to work with Sven Goran Eriksson, which young player wouldn't?
"And that is how it stands at the moment."