AC Milan keeper Gianluigi Donnarumma suggested Juventus "always" get the late decisions as a 97th-minute penalty gave the champions a 2-1 win on Friday.
Donnarumma put in a tremendous performance but could not stop Paulo Dybala's penalty with the final kick of the game after Mattia De Sciglio was adjudged to have handled Stephan Lichtsteiner's cross.
And Milan's goalkeeper told reporters after the game: "It's not possible, it's always them."
The 18-year-old Donnarumma, who has been linked with a future move to Juventus, also reinforced his statement by turning to Milan's travelling support and kissing the club badge on his shirt.
Dybala had no sympathy for Milan's conspiracy theory, however, saying: "The other sides have been complaining about Juve for six years. Perhaps they should try another method."
Milan's Carlos Bacca, who had left the game 40 minutes earlier, also had to be restrained from going after referee Davide Massa, forcing Milan coach Vincenzo Montella to apologise for his goal scorer.
"Everyone has their interpretation and I want to apologise for the situation at the end, as that is unforgivable," Montella told Mediaset Premium.
"Massa told me he took the responsibility of giving the penalty. I am told he was far away and couldn't have seen it. I prefer not to talk about referees, even if on days like this it becomes difficult!
"Complaining doesn't get you anywhere. It's pointless. We have to focus, stay calm and accept that referees do make mistakes. We can only hope that the errors go in our favour.
Juventus boss Max Allegri said he was already preparing to leave the pitch when the penalty was given.
"The game was over," he said. "I was already in the tunnel and I preferred not to see the penalty. We were going to either win or draw. Paulo did well, because it's never easy to put a penalty past Donnarumma, especially in the form he was in tonight with some remarkable saves.
"I never comment on refereeing incidents, whether in our favour or against. The officials were close by, if they gave it, then that was their decision.
"Incidents go for and against, that's football, and I didn't sit here complaining about penalties against Udinese. I said we played badly and deserved no more than a point."
Despite the controversy, Allegri felt his side were well worth the three points.
"Tonight Juve deserved the win, we played better than Milan overall, even if this is a side that never gives up and kept standing under great pressure," he said.