Cologne offer stranded travellers free tickets
Hundreds of thousands of passengers have been stuck at airports across much of northern Europe due to a volcano erupting on Iceland that has sent a plume of smoke across the continent.
Cologne/Bonn airport shut down on Friday along with most of the country's airports.
Passengers need only show their airline ticket to get free entry to the stadium for the match against VfL Bochum, the club said on their website.
"As long as stocks last," the statement added.