Three Bulgaria Under-21 players will be interrogated after sharing a video of themselves driving a cart around Frankfurt airport shouting at people.
The Instagram post was particularly ill-advised as it came the day after they lost 1-0 to their counterparts from Luxembourg.
Two of the players identified are Vitosha Bistritsa striker Nasko Milev, 22, and Botev Vratsa defender Ventsislav Kerchev, 21, on loan from Ludogorets Razgrad.
The Bulgarian FA released a statement saying:
The 3 players have damaged severely Bulgarian football’s reputation.
It is believed the players will be punished pending interrogation from their FA’s Ethics committee.