Juventus manager Massimiliano Allegri said AC Milan players influenced the referees to disallow his side's goal in Saturday's 1-0 defeat at the San Siro.
The outcome could have been different after a first-half free kick from Juventus midfielder Miralem Pjanic was controversially disallowed for what looked a tight offside call, having initially been given by the officials.
And Allegri suggested the officials would have let the goal stand if not for the remonstrations of the Milan players.
"They did well to score and we were unlucky," Allegri told Mediaset Premium. "We played well on a technical level and we had scored, but it was disallowed.
"These things happen. Unfortunately the goal was valid, but Milan's protest made the referee doubt his own decision.
"We should, as teams, focus on playing football and not put more pressure on to the referees. I want to understand whether it was the referee or the assistant who reversed the call."
After seeing his side's six-match winning run brought to an abrupt halt, Allegri wants the team to quickly dust themselves down ahead of Wednesday's visit of Sampdoria.
"I am sorry to come out defeated from Milan, but this should not affect us and indeed we must now prepare for the next game," Allegri said.
"We had taken command of the game and it was not easy, because Milan is doing great things and has many interesting young people.
"We tried to press and I think the team has provided a good performance in this regard.
"The team has been ordered in the field and also from the physical point of view, we did well... we just lacked a goal."