Considering player contracts in Germany

In Germany, players can typically sign pre-contract agreements with foreign clubs, but the rules change when it comes to pre-contracts within the same association. Generally, it's not allowed to negotiate with other clubs domestically under specific domestic rules, which could vary. This requires caution, especially referencing sources like "Kicker." I should check with the user about what they want me to do: translate, write a quick report, list potential next clubs, or make a data comparison.