Cedric Bakambu will have the choice of joining either Swansea City or Freiburg with offers from both clubs on the table.
Bayer Leverkusen claimed a shock 2-0 Bundesliga win at Borussia Dortmund on Saturday, while Hannover beat Schalke.
Haris Seferovic's goal was enough for Eintracht Frankfurt to make a winning start to the season, beating Freiburg 1-0 at the Waldstadion.
Bayern Munich bounced back from their German Supercup disappointment by beating Preussen Munster 4-1 in the German Cup.
Matthias Ginter has completed his move from Freiburg to Bundesliga rivals Borussia Dortmund.
Freiburg director Jochen Saier has said the club will turn down Borussia Dortmund's "final bid" for Matthias Ginter.
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