Bayern Munich hero Didi Hamann has slammed Erling Haaland's entourage over last week's antics.
The defeat comes after the father of Dortmund star striker Haaland, Alf Inge, and agent Mino Raiola were spotted in Spain this week negotiating deals with Barcelona and Real Madrid, with reports stating the pair also discussed potential deals with Premier League teams.
Liverpool icon Hamman told Sky Deutschland: "It's the most important game of the season and you are not able to address this behaviour because you are afraid to upset the player.
"Dortmund should think about why the players are always walking all over them. They lack leadership there.
"The behaviour of Haaland's father and Raiola is unspeakable, disrespectful, a cheek. If he wants to go, let him go.
"Dortmund paid a lot of money for an 18-year-old, he should be happy that he can play there."
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