With time running out, Douglas Costa had a strike ruled out by technology, with Ron trudging to the touchline to watch over the match official's shoulder.
Ronaldo had moments earlier shown his skills as he took on his man and fizzed the ball in to Costa – with Juve believing they'd doubled their lead late on.
However, the video replays revealed a Blaise Matuidi foul in the build up to the effort.
Juventus went on to win the game 1-0 thanks to a first-half Mario Mandzukic strike to extend their lead at the top of the Serie A table.
Ronaldo and Co sit eight points clear of Napoli – and a whopping 25 points above struggling Roma, down in tenth.
Elsewhere, Juve are primed to battle Bayern Munich to land Arsenal star Aaron Ramsey in January.
The Welshman, 27, is a free agent next summer and will leave the Emirates after the club's contract offer was sensationally withdrawn.
Juventus are also chasing another Premier League outcast… Manchester United star Romelu Lukaku.
Calciomercato are reporting that Juve believe the 25-year-old could be a long-term replacement for Mario Mandzukic.
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