The German Under-19 captain is rated as one of the best young players in the Bundesliga, and the midfielder has already been linked with a host of clubs.
Borussia Dortmund, Arsenal, Manchester United and Liverpool are all reported to be on his trail.
But Freiburg manager Christian Streich has ruled out his club allowing Ginter to depart.
Streich told Sport1 media: "There is no doubt he will be staying on.
"Matthias (Ginter) has a contract with our club. A long-term one. In addition, he is also of the same opinion.
"He is having the good sense to agree to this. We are definitely not letting anyone else make our very own decisions."