RB Leipzig know they risk losing Benjamin Sesko.
The Slovenia international is on the radar of Europe's biggest clubs, including Arsenal, Chelsea and Manchester United.
Sesko joined RBL last summer from sister club RB Salzburg and the Germans are reluctant to lose the youngster.
However, Sky Deutschland says the decision could be taken out of their hands courtesy of a buyout clause.
Sesko can be signed for 50m, with the clause coming into effect in the summer.