He told The Mirror: "We're discussing the possibility of banning alcohol in the stadium and I make no secret of it. Through the spectacles of someone responsible for security and in charge of police deployment on that day, I would find it good.
"We are also currently checking at the moment to what extent we can apply banning alcohol in public places. In principle you're free to drink alcohol on the street in Germany, but in big areas where fans gather in overfilled spaces we want to forbid it.
"It's important all police in Germany adopt a mindset of seeing the fans as peaceful rather than a threat, but we will react if something happens. You can't exclude the fact that some will be coming with the intention of causing riots. My message to England fans is we will be prepared. If anyone does try to cause trouble we will move quickly and they will be sent home."