Borussia Dortmund chief executive Hans-Joachim Watzke says midfielder Shinji Kagawa will be allowed to leave for the right price.
The 23-year-old Japan international helped his side to a second straight Bundesliga title, but it appears his time in Germany is coming to an end.
Kagawa is reportedly eyeing a move to English Premier League giants Manchester United.
Watzke said on Monday Dortmund were prepared to sell Kagawa if a good offer was put on the table.
“He is no longer unsellable,” Watzke told Sport 1.
“If anyone should be interested, they should notify either the player or us.”
Kagawa’s agent Thomas Kroth said: “It’s not about money. The player has a career plan and some goals. That’s what it’s about.”