AC Milan midfielder Mathieu Flamini
The France international sustained ligament damage during Sunday’s Trofeo Berlusconi preseason match against Juventus.
While the start of the Serie A season has been delayed by a strike, defending champion Milan is already without several players.
Newly-signed left back Taye Taiwo is out for a month with a left ankle injury, while striker Zlatan Ibrahimovic has a more minor problem with his left ankle. Mark van Bommel and Kevin-Prince Boateng also have minor injuries.
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