That gallus approach is attracting attention. Even in a 3-0 defeat by Celtic last Sunday, Miller’s all-round game stood out, striking the woodwork twice.
A clip then circulated of veteran broadcaster Martin Tyler waxing lyrical about the teenager, while former Scotland striker Kris Boyd suggested the midfielder is now out of reach for both Old Firm clubs.
Experienced Motherwell duo Andy Halliday and Paul McGinn have also said Miller, who ended Wednesday’s win at Tannadice with the captain’s armband, is the best youngster they have ever played with.
When you consider Halliday trained with a teenage Billy Gilmour at Rangers, plus McGinn’s younger brother is Aston Villa captain John, the comments are “obviously a huge honour” for Miller.
But with the help of dad Lee – now a barber and a good one at that, according to his son – the youngster is able to keep a lid on things by putting plaudits and speculation to one side.
A Scotland Under-21 international, much of the chat surrounding the teenager has been whether he is capable of making the step up to the senior squad.
His dad believes he is “good enough” now, while Miller says “I’ll be ready” whenever the call comes.
Regardless, it feels somewhat poignant that his first appearance at the national stadium is set to come for the club he has dedicated more than half his life to.
The Fir Park club travel to Hampden knowing victory against a troubled Rangers side would take them to within a win of their first major honour in 33 years.
Miller recognises Motherwell will still be “massive underdogs” in the tie, but the teenager is eyeing an opportunity to make himself, along with his team-mates, a club legend.
“We just need to go out there and enjoy it,” he says. “That’s all we can do, we know it’s a massive game for everybody involved.
“And we know we have a chance to make history – that’s the main aim.”