Goalkeeper Dan Twardzik, who previously played for Bayern Munich and is now plying his trade for Como in Serie C, Italy, has been training with Jim Leighton and the squad.
Meanwhile New Zealander, Te Atawhai Hudson Wihongi, who is a centre midfielder and friend of Dons striker Rory Fallon, has also been making use of Aberdeen's training facilities.
An Aberdeen FC spokesman said: "With the January transfer window just around the corner the manager is constantly reviewing ways in which to develop the current squad and will open the door to a number of trialists over the course of the next few months."