And Kabak, 20, is on Liverpool’s shopping list with the English club feeling that a deal can be done.
However, with financial problems hitting them hard, Schalke are now starting to think about selling Kabak.
Kabak’s €45m release clause only comes into effect next summer, leaving the Gelsenkirchen club free to negotiate a price.
According to BILD, Schalke could accept €35m for a player they paid €15m for last summer.
Selling Kabak would be a bitter loss for Schalke as he is an undisputed starter under coach David Wagner.
In total, Kabak made 28 appearances for Schalke this season, scoring three goals.