The Nerazzurri earned a 4-2 victory at San Siro, though had gone 2-0 up in the opening nine minutes.
"We started really very well and once we got to 2-0 up, we started to show off and play more for the crowd than to get goals. We shouldn't do that," the Coach told Sky Sport Italia.
"We lost concentration and conceded a goal, so we could've done ourselves even more damage and in future we'll pay for that attitude.
"This is a team with many young players. As long as everyone was concentrated and did their part, we played a fantastic game. As soon as we went deeper and took our foot off the gas, Verona put us under pressure.
"I told the lads that until we learn these lessons, we cannot think of troubling the top teams."
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