Max Allegri claims Milan knew that Inter would somehow fight their back into the title race.
Back-to-back draws in Serie A have allowed Inter to close in on Milan at the top of the table.
Five points is all that separates the two sides and Inter still have a game in hand.
Speaking to Milan News, Allegri said: "The season is long. There are still many games left. I have never seen a team win the League in Italy with two months to spare.
"We knew that Inter would return to fight for the Scudetto. Napoli are having a great season and Roma are in the fight.
"The thing that we have to do now is stay concentrated."
Asked if he feels Zlatan Ibrahimovic and Alexandre Pato are compatible, Allegri said: "They only have to play together more and get to know each other better."
Finally, he addressed concerns that Ibrahimovic is exhausted.
"He never has a normal week in which to rest, but I believe that right now it's all in the mind," Allegri concluded.