The Metropolitan Police have announced that they will investigate the injury suffered by a Chelsea steward in the Blues' defeat to Manchester United on Sunday.
The match itself was marred by two red cards and an offside decision as United ended Chelsea's unbeaten run in the Premier League this season.
It is not yet clear how the steward suffered the injury, but objects were thrown from the crowd when Javier Hernandez handed the away side the lead in the final 15 minutes.
Meanwhile, the Football Association has opened an investigation into claims that referee Mark Clattenburg used "inappropriate language" towards Chelsea players during the Premier League encounter.
Germany
Switzerland
Hungary
Scotland
Spain
Italy
Croatia
Albania
England
Denmark
Slovenia
Serbia
Austria
France
Netherlands
Poland
Romania
Belgium
Slovakia
Ukraine
Portugal
Turkey
Georgia
Czech Republic