Leicester City face being charged by Uefa after FC Copenhagen fans let off flares at the King Power Stadium before Tuesday’s Champions League match.
The Danish champions also face sanctions from European football’s governing body over the flares.
But Uefa holds host clubs responsible for security inside and around the stadium before, during and after games.
A home club in a Uefa competition can be sanctioned “unless they can prove that they have not been negligent”.
The regulations come under article 16 of the European governing body’s competition rules, which cover the Champions League.
In October 2014, Arsenal were charged initially over flares thrown on to the pitch by Galatasaray fans at Emirates Stadium. The sanction against the Gunners was later dropped, and the Turkish club fined £39,570.
Elsewhere, three Polish football fans were arrested in Spain on Tuesday hours before Legia Warsaw’s Champions League meeting with Real Madrid, AFP reported.
The three supporters, aged 31, 33 and 34, are alleged to have attacked waitresses in a bar in the La Latina district of Madrid, stealing the mobile phone of one woman and attempting to rob cash from the till, a police spokesperson told the news agency.
Legia have already been made to play their home game against Real, on 2 November, behind closed doors.
The Polish champions were punished by Uefa last week for racist behaviour and fighting among the home fans during a 6-0 defeat by Borussia Dortmund.
Subscribe to the BBC Sport newsletter to get our pick of news, features and video sent to your inbox.
Article source: http://www.bbc.co.uk/sport/football/37699054