Juventus' ideal start to the season came to an end in Turin on Saturday as Genoa earned a 1-1 Serie A draw on Ivan Juric's return as coach.
Ronaldo became the first player to fire 400 goals in the top five European leagues when he bagged the opening goal against Genoa.
However, coach Massimiliano Allegri believes this result will help his side ahead of what is arguably its toughest test yet, Manchester United on Tuesday in Ronaldo's return to Old Trafford.
Ronaldo's career has seen him plunder goals with Manchester United and Real Madrid before his move to Italy in July, and his prolific form has continued.
The Croatian boss replaced Davide Ballardini before the worldwide break for his third spell in charge of Genoa and he made an immediate impact as the Italian champions failed to record a victory for the first time in nine league games this season.
"We drifted out of the game after a good start to the second half and, instead of making it 2-0, we let them make it 1-1", Allegri said.
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"He's been very humble and has brought even more focus and a sense of responsibility to the team", he said. Daniel Bessa equalized in the second half to make it 1-1.
"But it's a draw that serves us well".
"I think we deserved to win it, especially when we got back into the game and we really did get on top, but this is what we have to do against Juventus".
If he does require surgery, the Germany global could also miss the reverse fixture at the Juventus Stadium on Wednesday, November 7.
He tapped in after Joao Cancelo's shot was blocked - having earlier hit the post with a header.
With the pressure off, Marko Rog then added a third with five minutes to go.