Ronaldo and Juventus are currently in pre-season friendly action against Tottenham as the Old Lady look for a winning start under Sarri.
The Italian was named as the club’s replacement for Massimiliano Allegri last month after the 51-year-old chose to take a sabattical.
Juventus and Tottenham are currently drawing 2-2, with Ronaldo and Gonzalo Higuain scoring for Juve and Erik Lamela and Lucas Moura on target for Spurs.
But Ronaldo appeared to react angrily after Sarri decided to take him off with the match still up for grabs.
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