Jocky Scott has returned to Aberdeen for a third spell after being handed the role of first-team coach.
The 64-year-old - who played for the Dons in the 1970s and managed them along with Alex Smith a decade later - will join up with manager Craig Brown and assistant Archie Knox.
The three have a wealth of experience in the game and a combined age of 201.
The club say he will work "primarily with the young members of the first-team squad".
Chief executive Duncan Fraser said: "We recognised at the start of the season that with the very high levels of young players throughout the club that an additional coaching resource would be of real benefit.
"Craig identified Jocky who has a fantastic reputation and we are delighted to have him on board.
"This appointment will also enable Neil Cooper to dedicate 100% of his efforts on developing the U20 squad.
"The work Neil has done in recent years has been excellent and we are seeing the rewards for all his efforts with the emergence of the young players now making the step up to the first team."