The 18-year-old winger was wanted by the Scottish FA to take part in a pair of friendlies this week.
But after Fraser played a key role in the Dons' 2-1 win over St Johnstone, Aberdeen boss Craig Brown approached his former employers at the SFA to ask for a favour from youth team boss Ricky Sbragia.
Brown said: "I want players to go with the national team where possible and they've requested Ryan.
"But I'll need to check the provision they've got with other players because he is certainly a key man in our team now.
"He is a very talented winger."