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Francesco Acerbi, Age: 24, Italian
He would have been 20 when he watched Željko Kalac's career at Milan implode in the span of 58 excruciating minutes during a pre-season friendly against Chelsea. The point is that you can lose the trust of your teammates, management and the supporters in a meaningless game.
Acerbi hasn't given the coaching staff any reason to start him because his pre-season has been forgettable. Rodrigo Palacio probably wishes he could play against Acerbi every week.
AC Milan News tweeted Acerbi saying: "My Milan idols? I adored Weah. I have videotapes with all his goals, and obviously Van Basten."
Milan supporters should send Acerbi some archival footage of Paolo Maldini, Franco Baresi, and Alessandro Costacurta.
Cristián Zapata, Age: 25, Colombian
Acerbi looked reasonably solid when he did play Chievo, yet has looked terrible in pre-season. Whereas Zapata forgot how to defend at Villarreal, but performed like the Udinese Zapata against Juventus.
Philippe Mexès, Age: 30, French
On paper, he's the best centre-back Milan at this moment, which shows the dearth of defensive talent at the club. He's prone to making mistakes, he struggles against tricky forwards and isn't reliable.
Daniele Bonera, Age: 31, Italian
When he's good, he'll keep Lionel Messi at bay. When the 31-year-old is bad, he is disastrously bad. That being said, considering the short-comings of Milan's centre-backs, this is Bonera's best chance to make the transition from squad player to weekly starter.
Mario Yepes, Age: 36, Colombian
When he was younger, he was a beast, but nowadays, he's just a squad player.
So now you may understand why signing someone of Mapou Yanga-Mbiwa's quality would radically improve Milan's back four.