Marchetti wanted to discuss with ultras leaders his irritation with earlier protests.
"It is our fault to a degree, as we haven't earned as many points as we could've done," said coach Vladimir Petkovic.
"At the same time, I have never seen a team not give its all. The players are nice lads and fight for the jersey.
"We live with the fans, respect them and hope they respect us too. It's good that if things have to be clarified, they are done in the open."
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