Nyon - Cologne have been ordered to pay Arsenal £53 000 by UEFA in compensation to help repair damage caused by their supporters during last month's Europa League tie at the Emirates Stadium.
As well as the fine, European football's governing body has also imposed a one-match travel ban on Cologne fans, which is suspended for two years in the event of further disturbances.
The sanctions announced Monday come after crowd trouble overshadowed Arsenal's 3-1 victory in London on September 14.
More than 20 000 German fans flooded into England's capital as the Bundesliga side made their first appearance in European competition for 25 years.
Cologne were given 3 000 tickets to distribute to away fans, but the Group H tie was delayed by an hour as German fans without tickets tried to get into the stadium.
It is estimated 15 000 Cologne fans found their way into the Arsenal stadium and police arrested five fans on the day of the game.
Although Cologne apologised to Arsenal, UEFA has charged the German club over crowd disturbances, setting off fireworks, throwing objects and acts of damage by the visiting fans.