Manuel Akanji is debating his future after Galatasaray hit Manchester City's valuation of the defender.
The Turkish champions want to land Akanji as well as City goalkeeper Ederson, while also holding long-standing interest in Ilkay Gundogan.
Galatasaray are willing to meet the £15million required to land Akanji, who does also have interest from elsewhere ahead of the transfer window closing on September 1.
The Switzerland international joined City from Borussia Dortmund for £15m three years ago, becoming an integral part of their Treble success.
Pep Guardiola wants to trim the numbers in his squad this month and currently has nine defenders at his disposal.