The match, on Friday September 1, is one of only two being played in the competition due to a change of format.
An SFA spokesman told RedWeb: "This is a huge match for the Under 21s and is a game they will have to win if they are to progress in the competition, so it will have a real cup-tie atmosphere. We know that a large and passionate crowd will support the team at Pittodrie, which makes it the ideal venue for this match."