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The San Siro is the largest soccer stadium in Italy, holding a shade over 80,000 people. Not only is it the home of Milan and Inter, two of the largest and most successful clubs in the world, it is also the place where FIGC brings the national team when they know a game is critical—such as last month's World Cup qualifying matchup against Denmark.
Looking on that, it's surprising to look at Milan's recent numbers in their aging home. The rossoneri have only won one of their last five home matches in the Champions League, and have lost three home matches in Serie A so far this season.
One can look at some of the matches that I've just quoted and start pointing out flaws in it. Two of those Champions League matches last year were against Barcelona—a 3-2 group stage loss and a goalless draw in the first leg of the quarterfinals. One of the three home losses was to Inter, which makes the home field advantage debatable.
But to be unable to score a single goal at home against Belgian outfit Anderlecht and lose to significantly inferior domestic opponents Sampdoria and Atalanta spells trouble. Milan's fans have been speaking with their feet this season, leaving their underperforming team to play before less than full houses at points this season.
Milan has been looking with a jealous eye at the new Juventus Stadium and will probably end up having to either buy the San Siro from the city of Milan or construct their own stadium in order to keep up with Juve and other teams that have stadium plans either in conception or, in the case of Roma, already rolling.