Uefa has opened disciplinary proceedings against Bulgaria and England following Monday's Euro 2020 qualifier in Sofia.
Charges against the Bulgarian Football Union include the racist behaviour, throwing of objects and disruption of a national anthem by home supporters, and showing replays on a giant screen.
The English Football Association has also been charged with disruption of a national anthem, as well as providing an insufficient number of travelling stewards.
According to a Uefa statement, the case will be dealt with by the governing body's control, ethics and disciplinary body, with the date of the meeting yet to be confirmed.
