Derby match have always given us tension and tight matches so it's hard to predict who will win, but regardless, I think the game against Milan is crucial for Inter to keep their distance from Napoli in the Scudetto race this season, and even if Milan has won the previous two derby match it won't guarantee them can win again in the match, Because after all, Inter have a strong motivation return for equalize points with Napoli in standing and also take revenge for their previous defeat, both teams have a big motivation to win the match, but for derby match later it is clear if Inter Milan motivation to reach the top of the standings is greater than Milan in my opinion.
Even Inter Milan lose to AC Milan in the Milan derby, they will not lose the battle. Napoli will have a difficult match with AS Roma too and they can lose points to Roma. If Inter Milan have 6 points less than Napoli after Milan derby and if Napoli win against Roma, Inter Milan will have one match to reduce 6 points to 3 points. With many matches in this season, 15 more matches, 3 points are not too big difference and Inter Milan won't have to feel too fearful about that.
They clearly want to beat AC Milan and wait for chance to equalize current 3 points with Napoli to 0 point, and if possible will use a postponed match to create 3 points gap with Napoli. This week with two big matches: AC Milan vs Inter Milan; and Napoli vs AS Roma, the Scudetto competition will become very different.