The Viola coach was delighted with his side's showing in midweek, but is looking forward to seeing their reaction and focus amid the wave of enthusiasm around the club
The 38-year-old told a press conference that he was proud of his side's start to the season, but made it clear that he is not underestimating the challenge posed by Inter ahead of their clash on Sunday.
“It is wonderful to see your team playing with such character," he said.
"However, it will be important to see how the team reacts after the euphoria and enthusiasm. I hope we won’t underestimate this test or lose concentration.
"Don’t forget Fiorentina have not picked up points in Milan for 10 years and that can be an added motivation.
“We must not start out with arrogance. Inter are a very experienced side with excellent individual talents. We need to play with intensity."
The Fiorentina boss also spoke of his friendship with Inter coach Andrea Stramaccioni and said he did not agree with some of the criticism that he had recieved.
“He is a friend and we’ve worked together," Montella added.
"In football, as in every area of work, you are often judged and if he was chosen to be coach of Inter then he must have all the qualities for that role. It is a constant risk for everyone who makes decisions."
The Nerazzurri go into the game on the back of a 2-0 win over Chievo on Wednesday, but will be without two key players this weekend, though Montella does not believe they will be severely weakened.
“Rodrigo Palacio and Wesley Sneijder are out, but Inter certainly have the players to replace them. I don’t agree with the negative criticism of the Nerazzurri’s season," he concluded.