That’s the view of Fabio Capello, who has managed both Serie A club.
Juventus make the trip to the San Siro having won ten of their 11 games in the Italian league.
They sit three points clear of Napoli though today’s match is their game in hand.
Juventus suffered their first defeat of the season in midweek, letting a 1-0 lead slip to Manchester United in the Champions League.
AC Milan sit fourth in Serie A, ten points behind Juve having lost twice in the league this season.
And former England manager Capello believes Ronaldo will impress with the Old Lady favourites for the win.
“I expect great things from the most anxiously-awaited player: Cristiano Ronaldo,” Capello told TuttoJuve.
“Despite that defeat, Juventus arrive at San Siro in great shape and I don’t see any particular problems within Max Allegri’s team.
“It’s going to be an interesting game in so many ways. The Bianconeri have had a few more days to rest and are the favourites for the victory.
“Milan have some players who can cause problems for Juve, in particular Suso and Gonzalo Higuain if he recovers in time.
“However, the biggest issue is not how much pressure Milan could put on Juventus, but rather Juve’s own concentration levels at San Siro.”
Cristiano Ronaldo had scored the opener in Turin against his former club on Wednesday.
But a Juan Mata free-kick and own goal from Alex Sandro, both inside the final five minutes, gave United the victory.
And Ronaldo believes the loss may help Max Allegri’s side in the long run.
“It’s never nice to lose, but maybe this defeat comes at the best possible time,” Ronaldo said.
“We have a great team, we’re top of the group and I’m sure we’ll go through as group winners.”