Let's talk about why Dortmund can't keep his superstar.

In fact, Dortmund is also a Bundesliga giant. Although domestic fans don't recognize Dortmund very much, Dortmund's reputation in Germany is still very high, but many players have been poached by Bayern, mainly for many reasons.

First of all, no club in the whole Bundesliga can compete with Bayern, and its financial resources, achievements and reputation are second to none in the Bundesliga and even in Europe. Many German players or players who play in the Bundesliga like Bayern as Bayern fans, or hope to have greater development, so they are willing to go to Bayern for development.

Secondly, Bayern has a good reputation in the Bundesliga. A few years ago, a club went bankrupt because of poor finance. Bayern organized a friendly match with it for free, and all the proceeds helped it solve its financial crisis. Therefore, although Bayern has been digging for people in the Bundesliga, there is no so-called sworn enemy. Unlike Dortmund and Schalke 04, the Ruhr area is a deadly enemy, and the old and the dead are not in contact! There is a joke. When Hitzfeld coached Bayern, he played golf with beckenbauer. The emperor asked Hitzfeld, how do you feel? Hitzfeld agreed, and then beckenbauer called Hearnes and said yes. Then after a while, the phone came and said it was signed. Although it is a joke, it is enough to show Bayern's popularity and signing efficiency in the Bundesliga.

Finally, people who sign Dortmund from non-Bundesliga teams are generally big giants, and their salary in the Bundesliga is relatively low (the Bundesliga mechanism is basically different from the corporate system of other leagues, and profit is very important), so many players will choose to go outside for high salary and greater development, which is also the reason why Dortmund is not strong enough.

To sum up, it's not that Dortmund can't keep people, but that he is an excellent player. It's really hard to deal with being poached by a giant. There are many such teams in Europe, such as Porto, Benfica and Lisbon, but they are so thorough that they simply sell their players at high prices after becoming famous. This is how the reputation of European black shops comes from.