Police said: "There is an agreement between the Central Information Office for Sports Operations (ZIS) and the German Football Association (DFB) regarding international test matches. Every planned test match with international participation is checked for certain security aspects. If even one of these security-relevant requirements is not met, such a test match can only be assessed negatively from a police perspective. To ensure that a match can still take place, the clubs have the option of excluding spectators from the event."