The 18-year-old, who has represented Scotland at every age-group level from U15 to U21, has had his path to the first team at club level accelerated by Frank Lampard's appointment as manager.
"In days gone by, people said you had to go through the proper steps before becoming a full international," Miller said. "But look at England and what they have done in the last few years.
"I think we could be getting Billy Gilmour in now and there's probably a few others. I know he's been away with a few camps training and it is a huge step - and especially without first-team football - but we need to get these guys in to progress.
"England can do it. Wales have done it. Can we fast-track him? I also believe you have to have earned that right, but there are exceptions."
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