Soccer: Juve 'not at best' before Milan clash
Leaders Roma face Inter in weekend's other big match04 October, 16:42
Juve, who are aiming to win their third consecutive Serie A title, are joint-second alongside Napoli with 16 points from six games, two points behind leaders AS Roma.
But their recent performances have not been impressive and they had the help of poor refereeing decisions in wins over city rivals Torino and Hellas Verona in their last two matches.
The two-time European champions have also made a stuttering start to their Champions League campaign, with draws at Copenhagen and at home to Istanbul side Galatasaray on Wednesday, when poor defending led to them being held 2-2.
"Too often the opinions about us are excessive and we go from being a steamroller side to being in crisis and then back to being steamrollers and then in crisis again," Chiellini told a press conference. "These assessments go too far. But even I can see that at the moment we are not playing our best football of the last two years.
"Nevertheless, we are on a positive path". Juve will be without Montenegro forward Mirko Vucinic against Milan and Switzerland full back Stephan Lichtsteiner is a doubt after the pair took knocks against Galatasaray.
But Juve's problems are small compared to the injury crisis Milan are enduring, with playmaker Kakà, forward Stephan El Shaarawy and defender Mattia De Sciglio among a host of players in sick bay.
Milan coach Massimiliano Allegri is also unable to use Italy striker Mario Balotelli, who is serving the final part of a three-match ban for abusing the referee at the end of a defeat to Napoli last month.
Milan are 10 points off the pace in ninth place after a slow start to the season.
In the other big match of the weekend, Roma will visit the San Siro on Saturday aiming to defend their perfect record against Inter Milan, who are four points behind them in fourth. Napoli entertain eighth-placed Livorno on Sunday, when sixth-placed Lazio play host to fifth-placed Fiorentina.