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Porto caused a stunning upset last season by dumping Juventus out of the Champions League at the round-of-16 stage.
The Primeira Liga side secured a 2-1 victory at the Estadio do Dragao in the first leg before suffering a 3-2 defeat at the Allianz Stadium, but Porto progressed to the quarter-finals thanks to the aggregate scoreline.
However, Portuguese newspaper A Bola reported that the incident involving Porto's stadium announcer came after Juventus were knocked out of the Champions League.
Do Dragao speaker Fernando Saul pulled no punches towards Juventus and Ronaldo in two Instagram Stories.
According to Football Italia, he branded Juventus as the "Italian thieves" and called out that "pig Ronaldo" in shocking remarks.
The publication added that Saul even fired a disparaging insult to Ronaldo's mother, Maria Dolores dos Santos Aveiro, who he called a "toothless" crone.
The Disciplinary Board of the Portuguese Federation condemned the behaviour and handed down a €1,430 fine that Saul would be required to pay to Ronaldo.
A representative of Ronaldo's former club Sporting CP raised concerns over Saul's comments after spotting them on Instagram Stories, according to reports.
Football Italia reports that Saul was previously in hot water after he received a 30-day ban for shouting into the stadium microphones that they were "tired of being robbed" during a Benfica clash.
Ronaldo has returned to pre-season training with Juventus this summer, despite uncertainty surrounding his future in Turin.
The 36-year-old Portuguese superstar was the top scorer at Euro 2020 this summer, but Portugal crashed out of the competition after a 1-0 defeat to Belgium in the last 16.
Juventus manager Massimiliano Allegri praised Ronaldo as an "extraordinary player" and insisted that he is ready for the new Serie A season.
Speaking at a press conference on Tuesday, he said: "Ronaldo? He's back with great motivation.
"Ronaldo is a great champion, an extraordinary player and an intelligent lad. I talked to him just as I talked to the other players.
"I told him that this year is an important year, that I am happy to find him again and that he has a greater responsibility than three years ago because we had a very experienced team back then.
"Today, in addition to putting his qualities on the pitch, I also expect things from him in terms of responsibilities."
Featured Image Credit: PA
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