Having drawn 1-1 in Holland last week, the tie is finely balanced ahead of their meeting at the San Siro but Allegri doesn't want a negative display from his players.
"There should be a proactive attitude. They are a team that creates a lot and we can not think of doing a defensive game. We must start from the good performance in Eindhoven," he said at his press conference .
Milan have been quiet in the transfer market so far this summer, but it is believed that they are likely to bring in new signings should they qualify for the group stages.