Levski Sofia, currently second in the Bulgarian league, have sacked coach Ilian Iliev after a string of poor performances, the club announced on Friday.
"We have parted company with Ilian Iliev," Levski chief executive Ivo Tonev said, adding that the decision was reached by mutual agreement late Thursday.
Assistant coach Nikolay Mitov will take over until the end of the season, he said.
Levski have won only one of their last five league games, drawing three and losing one.
Their latest away draw on Wednesday against outsiders Pirin Gotse Delchev outraged fans, who tried to storm the team bus and later demanded that the junior team complete the season.
Levski are currently second in the table after 21 games, two points behind leaders Ludogorets Razgrad.