Galatasaray are interested in signing Astra defender Junior Morais a close source told Turkish-football.com.
The Brazilian defender has a release clause worth in the region of €500,000 and the Lions are reported to be preparing a move.
Greek side AEK Athens have also been closely linked with the 28-year-old centre-back.
Galatasaray have had a quiet transfer window compared to their cross-city rivals Fenerbahçe who have already made eight transfers this summer.
The reigning Turkish champions lifted the Süper Lig title for a record 20th time last season and then went onto win the double after beating Bursaspor 3-2 in the Turkish Cup final – 16th Turkish Cup title.
The Lions have now won the double a record six times and booked a place in the Champions League group stages for the fourth consecutive season.