Frankfurt sports director Marcus Klescher believes that in the face of unequal competition with the Premier League, the German youth training system urgently needs to catch up.

Keller said: "Top players will not stay in the Bundesliga and will eventually go abroad. 90% of them choose England. On the one hand, this is naturally related to the financial framework conditions, but on the other hand, it also comes from the players' perception. Winning the Champions League in some English clubs is more important than in German clubs."

Keller further elaborated that the professional talents trained by Germany are too scarce. He believes that the German transfer market has shortcomings, especially in the right back, central defender, left back and forward positions. He said: "We have poor performance in the reserve of top players. Taking defense as an example, the primary focus should be on defensive ability, not on organizational offense or other aspects."

In addition, Kleech regards Frankfurt's Robin Koch as the best German defender today.