The 21-year-old defender has attracted many admirers over the past 18 months with the Bundesliga side.
But Stuttgart's sporting director Michael Reschke has moved to end speculation over his French international star's future.
The chief told Bild: "We are the ideal club for him right now and he feels that.
"If, in the future, a club from Europe's top 10 shows real interest, we'll sit down.
"Benjamin and his agent are aware of it.
"But, if this summer a club believes they can sign him for €30m, this club is profoundly wrong.
"We wouldn't even open the door for such a talk."