Federal President Fritz Keller is now looking at the possibility of letting 1,000 people into the arena. There is a loophole.

- The Berlin City Council are the ones responsible. Events in Berlin allow up to 1,000 people present. If the city council says yes, then we drive on it, Keller tells German TV.

The number of 1,000 people includes players and everyone who works in the arena.

All Bundesliga matches have so far been played without an audience.