Heres a thread I started 5 years ago, I reopened it a couple of times most recently in November last year
Here are the players mentioned in date order.
2018
Billy Gilmour-Brighton
Scott McTominay- Man Utd
Charlie Gilmour- Caley Thistle
Calvin Miller-Falkirk
Islam Feruz-last seen in Serbia
Alejandro Maroto-no idea
Anthony McDonald-Brechin City
Jack Aitchison-Exeter city
2019
Tom McIntyre -Reading
Ross McCrorie- Bristol City
Fraser Hornby-Darmstad 98
Stuart Findlay- Kilmarnock
2020
Dominic Hyam-Blackburn
Ryan Gauld-Vancouver Whitecaps
Liam Morrison-Wigan
Lewis Fiorini-Man City??
2022
Leon King- Rangers
So apart from Mctominay and Gilmour we really aren't very good at spotting future caps.
Ryan Gauld probably has the ability though.