Juventus coach Massimiliano Allegri says the team's defeat to Inter has given him cause for concern ahead of Sunday's Serie A clash with AC Milan.
Seven wins from their opening eight games of the league campaign has given the champions an early five-point lead at the top of the table, with their sole defeat coming in a 2-1 loss to Frank de Boer's side at San Siro last month.
And Allegri, who guided Milan to their last Serie A title in 2011, admits to being wary of Vincenzo Montella's in-form side.
"I have to congratulate Milan, because they're having a great championship," he said. "They have some good young players who will be the future of the Italy team.
"Milan-Juventus matches are always very close. Against Inter, we went out as favourites and we got a good whack.
"We must be careful: Suso and [M'Baye] Niang have technique, [Carlos] Bacca attacks the area, [Giacomo] Bonaventura is a creator.
"We have a lot of respect for Milan. They're a young team, they're strong. They deserve second place, but the season is long."
"The only one we can bring back is Mandzukic. Chiellini won't be there, with a view to him being available for Wednesday. Neither will Pjaca," Allegri said.
"Marchisio will be called up - he managed 60 minutes in a friendly game on Wednesday. [Daniele] Rugani worked with the group and we'll see how much pain he has in his knee."
"The numbers tell you - he's been crucial. He deserves to start but I need players like him to make an impact off the bench," he added.
