Vladimir Petkovic and Zdenek Zeman have become the latest Serie A coaches to hit out at the level of officiating in Italy.
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Lazio boss Petkovic was unhappy after seeing his in-form side drop points for only the second time this season, losing 2-0 to Fiorentina, and having Cristian Ledesma and Hernanes dismissed in the final 15 minutes.
The Biancocelesti also had a Stefano Mauri goal ruled out for offside and a penalty appeal turned down when Juan Cuadrado appeared to handle the ball in the area, leaving the Bosnian boss feeling aggrieved.
"We gifted them the first-half and could not get hold of the game because Fiorentina were very aggressive and pushed high up the field," Petkovic told Sky Italia. "We were not at 100%. In the second-half we dominated until the decisions went against us. The goal was not offside clearly and I am told there might also have been a penalty for a Juan Cuadrado handling offence but I don't know.
"There were also some yellow cards that I did not understand. In any case, these are not alibis, as we should've done better. We must not diminish the credit owed to Fiorentina for their performance, as they were much more attacking and deserved the victory. Had it not been for these incidents then they might've deserved it even more."
Meanwhile Roma boss Zeman was left frustrated after seeing his side race into a two-goal lead before giving away a penalty and going on to lose 3-2 to Udinese.
Zeman questioned the award of the spot-kick and also took the opportunity to hit out at referees across Serie A as a whole.
He told Sky Italia: "After seeing the replays, I think it was not a foul for the penalty. It has been a bad weekend for referees. People say they don't decide tournaments, but I think on the whole they really can. Tonight Pablo Armero spat at Tachtsidis with the fourth official a few yards away, yet did nothing..."
"For me, these things are decisive. We started very well, creating another three great scoring opportunities along with the two goals in the opening half-hour.
"After conceding with a push on Osvaldo that wasn't spotted, we got irritable. Udinese play very well on the counter-attack and we were unable to stop them, so we conceded another two goals with our horizontal passes intercepted."
Zeman, 65, has also questioned Roma's ability to concentrate over 90 minutes after watching them throw away a 2-0 lead to lose for the second time this season.
"If you don't attack the ball straight away then you have problems," he added. "We ran backwards and it is difficult to defend like that. When we play our football and defend together, it is difficult to score against us."
"If I look at the first half-hour then I am not worried, as we are able to play good football and build something special. For now what we lack is concentration over 90 minutes. The things that seem simple ought to be treated with a greater sense of responsibility."