Honestly it looks like another terrible transfer from Galatasaray, as usual, they haven't made a good one in a long long time. They do not need a defensive player, they need a midfield and I mean they need it so much.
With the defense, they had marcao and victor which would be awesome duo, they do not need any help there at all, they have a good leftback as well, maybe sacha boey might be replaced but really not a big deal for the time being neither, hell their offensive line with mohamed, kerem and whoever they can find right now would still be good too.
Only thing they need is midfield, and yet they decided to spend the very limited resources on another defender. If this isn't some "let's make some money off this team via agents cut" deal, then I do not know Turkish football, typical useless transfer to get some money off the team and into the pockets of some people, obvious.
Are you talking about Abdülkerim Bardakçı? There is talk of Marcao leaving Galatasaray. In this case, it's a very logical move for them to transfer the defender. Because of the foreign restrictions, teams want to transfer Turkish players. Who would say no to such a transfer? You can use foreign players in midfield and forward positions.
I think 2.8 million Euro is a high figure, but Galatasaray likes to waste money like this. If they had not stepped in, Beşiktaş would have taken the player. But Beşiktaş's current management doesn't raise prices so stupidly.