Galatasaray are seriously interested in Granit Xhaka from Bayer Leverkusen. He still has 3.5 years contract but Galatasaray have huge budget for this transfer. They also want Maxim De Cuyper from Club Brugge for left back position.
It looks like they will get good money from sales of players this Summer. They want 35 million Euro for Barış Alper. Yunus Akgün also has 11 million Euro minimum fee release clause, so any team can activate this clause in the Summer. They may upgrade their transfer budget this way.
Letting players like Bans Aloer and Yunus Akgun leave might have dire consequences for the club if they are not replaced with good players who can cover the vacuum. Granit Xhaka is a world class midfielder. At 32 he is still a key player in Bayer Leverkusen and I doubt if Xabi Alonso will be willing to sell this player. It might happen if the German side gets a replacement during the transfer opening and if Galastataray offers an amount that will be difficult to resist.
The Swiss player will be a good addition to the Turkish Champions because he would bring his wealth of experience to the team. From my observations, Galastataray needs to fortify it's defense next season because they keep making mistakes and conceding cheap goals.