This is due to their Europa League game against Eintracht Frankfurt in which a huge ticket controversy took place.
UEFA state that fans of the opposition team must be sat separately at a designated away section. However, Eintracht fans were spread all over Camp Nou since Barca fans were actively selling their match tickets for high prices ahead of the game.
As a result, around 20,000 Eintracht supporters were at Camp Nou instead of the initially declared 5,000.
Barcelona will now be 'investigated' as the match host.
Source: Marca
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