Aberdeen have taken Quido Lanzaat on trial after the Dutch defender was released by CSKA Sofia.
The 29-year-old has an impressive CV having played for Ajax, Borussia Monchengladbach and 1860 Munich before joining the Bulgarian champions.
"We will have a look at Lanzaat over the next few days," said Dons boss Jimmy Calderwood.
"He only went to Bulgaria last year but left because they failed to pay his wages.
"It's rare to get the chance to sign a player with his sort of experience on a free transfer."