"This was a delicate moment in which the team could've sought alibis, but instead the squad just sought the victory," the 39-year-old told Sky Sport Italia.
"Milan never looked able to get back into the game, as Fiorentina seemed to be in total control, even if we were a little tired in the second half and didn't go on the counter as much.
"Can Fiorentina get into the title race? I only know the season has just started, the table is very tight and anything can happen."
The Florence-based club play host to Sampdoria next Sunday.