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Ac Milan's performance is difficult to predict, it could be said that it is not good and even tends to be inconsistent. In the Europa League, they won a landslide victory with Rannes and it is certain that AC Milan will qualify for the next round because AC Milan's aggregate is difficult for Rannes to catch in the second leg.
However, if you look at the domestic league, their performance is very bad, especially after losing to a weak team Monza, a painful defeat with four goals conceded, AC Milan's defense is so weak in the domestic league. From the last two matches which were very different for AC Milan, my prediction is that AC Milan's journey in the European League will not reach the final. Maybe AC Milan will only reach the semifinals, because of its unstable performance.
You are right that AC Milan performance is very difficult to predict because they do not have stability and consistency in the European League competition, but in terms of the existing percentages they currently have big chance of qualifying for the next round.
It just that we don't know whether after this AC Milan will still be able to win and it will be easier for them to continue competing for the title or not because the opponent that will be waiting for them is much stronger team.
Looking at AC Milan in the European League and also the domestic league, the differences will appear quite significant, this is the reason why there are still many who doubt AC Milan performance so far this season.
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A 3 goal advantage will make AC Milan more comfortable when playing in the second leg, but they still have to be careful because it is not impossible that Rennes will be able to make an extraordinary comeback even though it looks very difficult. Rennes themselves will go all out in the second leg in my opinion, because with 3 goals behind there is no other way for them but to continue attacking. If they play defensively it would be the same as allowing AC Milan to comfortably advance to the last 16 of the Europa League.
AC Milan must be able to anticipate this, they must strengthen themselves, especially in the midfield so that Rennes cannot freely control the match later. They also have to quickly find a rhythm before Rennes can find it. Because usually the club that first finds their rhythm in a match will open up their opportunities more in that match.
Yes, with an aggregate advantage of 3 points, AC Milan is more comfortable and calm in facing the second leg because that is big enough advantage for AC Milan to maintain its position and avoid defeat and fall.
Their match will be held tomorrow and we will see whether AC Milan is able to maintain its lead or suffers defeat due to the surprise given by Rennes, because it is difficult to believe that Rennes can do it.
I myself still quite sure that Rennes will not be able to overcome the 3 point deficit that occurred and if they do win it will still be impossible to score more than 2 goals.