Borussia Dortmund chief Hans-Joachim Watzke admits they will battle to keep hold of Erling Haaland.
The Norway striker is being linked with Real Madrid, Manchester City and Manchester United this week.
Asked if they can keep hold of Haaland this summer, Watzke told Die Welt: "Of course it will be difficult.
“But I am not saying that it is completely out of the question. We'll do everything we can to keep our top players loyal to us in the future.
"But here too the question arises: What is responsible and what is no longer?"
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