Bulgaria coach Krasimir Balakov has resigned four days after England’s Euro 2020 qualifying win was overshadowed by racism from home supporters.
Monday’s match in Sofia was stopped twice because of racist abuse directed at England’s black players.
However, after the match Balakov, 53, said he “didn’t hear anything”.
Bulgarian authorities have so far identified 16 suspects and made 12 arrests following the game.
Four supporters received fines and two-year bans on Thursday, with others remaining under investigation.