The result came despite Ronaldo helping Juve to an eighth consecutive Serie A title and Portugal win the inaugural Nations League crown.
Sari is determined for Ronaldo – who sat out Wednesday's 4-0 Coppa Italia last-16 victory over Udinese through illness – to add to his Ballon d'Or collection and match Messi.
"I would like to help Cristiano win the sixth Ballon d'Or first," Sarri told reporters post-game in Turin.
"It's really annoying thinking that someone won more [Ballons d'Or] than him. I think about him and I think helping him it is my goal and the goal of the team. It is right for him.
"[Paulo] Dybala is going to be one of the contenders in the next years. I think so."
While Ronaldo sat out, Juve forward Paulo Dybala dazzled with a brace and an assist against Udinese.
Dybala teed up Gonzalo Higuain for the 16th-minute opener following a stunning piece of combination play before curling a memorable strike past Nicolas approaching the hour mark, having converted a first-half penalty.
It took his season tally to 11 goals across all competitions and Sarri added: "Dybala is a top player. As every top player when they are becoming confident and having the right age, they are playing like a top player.
"I don't think a manager can teach something to a top player. Dybala is going to leave a mark in world and European football in the next years. He has got the right age to leave a mark and he's still got many years of his career. He is really confident in this moment after a few difficulties in the past."