Mangia was promoted from the youth team just 10 days before the start of the season, replacing the sacked Stefano Pioli, and his first ever Serie A match was a 4-3 victory over Inter.
"We worked with the same attitude and intensity over the past week as we did before. The difficult stuff is what comes next, as the win over Inter must be a starting point and not the finish line," said Mangia.
"Our next game is against Atalanta, who are a difficult team to face and will want to win on their home debut, especially as they have a six-point penalty to wipe out. I am convinced we'll step on to the pitch with the right attitude."