Furious Inter Milan president Massimo Moratti described Italian referees as "incapable" after his side were denied a late penalty in Sunday's 2-2 draw at home to Cagliari.
The Inter team, and coach Andrea Stramaccioni, declared a media silence after the stoppage-time incident.
"I can say that for three games in a row, we have had to deal with refereeing injustices, which have prevented us from getting the result," Moratti told the Mediaset Premium television channel.
"I cannot stay quiet in these circumstances," he said from the seat of his car after stopping to talk to reporters on the way out of San Siro. "That penalty was as big as a house"
"I don't think there's any plot against us, it's just that referees are incapable of doing their jobs."
Inter were furious after an alleged foul on Andrea Ranocchia in the penalty area failed to bring a spot kick and Stramaccioni was sent off as he led the Inter protests on the pitch.