[Europe's top referees' official hinted on Monday that referees could strike after the retirement of Anders Frisk because of death threats to him and his family.] We cannot just do nothing, ... There will be a demonstration of solidarity among the referees as you have never seen before.

He is back on the DFB list and is ready to work again.

Of course, we make mistakes like every player and coach. But that shouldn't lead to referees being sworn at or even threatened.