Milan has had a strong start to the game and is clearly showing that they can do everything they can to win it, but as of right now, their aggressiveness has gotten them into trouble as they have received a red card, which weakens their defense.
It was a clear penalty, but the decision of red card from German referee Daniel Siebert was too harsh and unnecessary IMO, the referee has ruined the game and the momentum that the Italian side started with has now cooled down. It may turn out to be a rough game with a lot of bookings for both teams. Milan now has an extra job and will have to be extra composed if they are to win this game.