Villarreal defender Mateo Musacchio was in Milan yesterday for a medical.
The Argentine is firming as the first signing of the post-Berlusconi era at AC Milan.
Sportitalia carried photos this morning of Musacchio's 'secret' medical at the Clinic "La Madonnina" in Milan.
The defender is expected to sign formally for Milan some time today.
Musacchio is due to be first of a raft of major additions made by Milan in the coming months.