Ronaldo just put his side 3-0 up with one of the greatest goals in the history of the competition and as he wheeled away in celebration, numerous homefans rose to their feet and applauding a rival player out of respect for the brilliance he had just served up.
It took the five-time Balon d'Or victor just eight minutes to get his name on the scoresheet for the Old Lady.
And now, having made the shock move to the Old Lady in a £99 million move, he's reflected on just how that special moment was.
The 33-year-old Portugal global will likely make his proper debut in Juve's first league match of the season at Chievo Verona next Saturday. It was wonderful. Something like this had never happened to me. He helped Madrid win four Champions Leagues titles - beating Juventus in the final in 2017 - and also won La Liga and the Copa del Rey twice. It was an unbelievable feeling. At first I was surprised.
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In total, Ronaldo scored 15 goals at World Cups and won the competition's Golden Boot award for the top scorer on one occasion. One of the best footballers of all time, Ronaldo , is in hospital after coming down with a bout of pneumonia while on holiday.
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Ronaldo's arrival had sparked rumours that the match would be moved to the Allianz Stadium such was the enthusiasm from fans after his signing, but the club chose to stick with the traditional bucolic setting.
"I feel great. Everything is good, the test was good, people around the stadium, the fans, the people in the training ground are very nice with me".
Ronaldo, who signed for Juventus from European champions Real Madrid in a shock 100 million euro ($117 million, Sh11.7 billion) deal exactly a month ago, will wear the Juventus kit for the first time in the club's traditional pre-season friendly between Juve's first XI and a "B" team in Villar Perosa, a small town 40 kilometres (25 miles) west of Turin.
The former Manchester United man says he has been hoping to pull on the black and white stripes of Juventus ever since he was young.