Mathieu Flamini is out for at least five months, so Milan look to Real Madrid and Barcelona for a replacement.
The French midfielder damaged knee ligaments during the Trofeo Berlusconi win over Juventus last week and was told he'll be sidelined for between five and six months.
With the transfer deadline only days away, the Rossoneri must rush to find a suitable replacement.
The Corriere dello Sport suggests the primary target will be Barcelona's 31-year-old Seydou Keita.
His options are more limited at the Nou Camp now that Cesc Fabregas has joined from Arsenal and Thiago Alcantara has shot to fame.
Another alternative is Lassana Diarra, who is set to leave Real Madrid and has been in advanced negotiations with Tottenham.
Milan must also consider the fact Gennaro Gattuso sits out a four-match Champions League ban for his altercation with Spurs assistant manager Joe Jordan last season.