English fans, for their part, were accused by Bulgarian media of booing the Bulgarian anthem.
Bulgaria's football authorities plan to appeal the 40 000 euro fine levied by Uefa's disciplinary body for incidents at the Euro 2012 qualifying match in Sofia on September 2.
Bulgarian Football Union (BFU) faced charges of "discriminatory behaviour relating to chanting by home supporters" and "setting-off and throwing of fireworks", according to the Uefa statement.
In a statement on its website, BFU said: "Contrary to reports in Bulgarian media that claimed that the fine is for racist incidents during the Bulgaria vs England game on September 2, the reasons for the decision have not yet been made public."
BFU said that it expected the reasoned decision from Uefa during the final week of November, which would spell out the extent of the fines under the two separate charges of racist chanting and fireworks being thrown on the pitch.
"In addition to appealing the decision, BFU president Borislav Mihailov, who is a member of Uefa's executive committee, will travel personally to Nyon [...] and use the opportunity to clarify the circumstances of Uefa's disciplinary commission," BFU said in its statement.
In the aftermath of the match, which England won handily 3-0, British media have accused Bulgarian fans of chanting racist slogans, a charge that the BFU has steadily denied.