Milan defender Thiago Silva expects Lazio, tonight's Serie A opponents, to be a threat in the Scudetto race.
The Rossoneri begin the season as favourites to retain their Italian title, but the Brazilian is impressed by the capital outfit.
"We have a Scudetto to defend and we can't disappoint the expectations of our fans," the stopper noted.
"However, Lazio will be fighting, like us, for the title. They have become stronger with Djibril Cisse and Miroslav Klose now in attack.
"I think the game against Lazio will be our most difficult in the League between now and December."
The Lazio tie arrives just days before Milan's big European game when they face Barcelona on Tuesday in Spain.
"The championship and the Champions League are two totally different competitions," the Brazilian added.
"Boss Massimiliano Allegri has made it clear this week that we have to just concentrate on Lazio. We'll switch our attention to Barcelona on Saturday."