Giovanni Bia, the agent of Andrea Cambiaso, confirmed that Milan inquired about his client while they were searching for a deputy left-back last summer:

Juventus Quickly Rebuffed Milan Approach for Cambiaso

Giovanni Bia, the agent of Andrea Cambiaso, confirmed that Milan inquired about his client while they were searching for a deputy left-back last summer: “A pair of Italian teams were after him in the past window. The Rossoneri came forward, and three or four Premier League sides were very interested."
After inquiring about Luca Pellegrini, Milan also asked Juventus about Andrea Cambiaso. However, they were met with a lofty request.

Milan Probe a Second Juventus Fullback for Backup Role

After inquiring about Luca Pellegrini, Milan also asked Juventus about Andrea Cambiaso. However, they were met with a lofty request as the Bianconeri intend to keep the player. They don’t want to loan him out again and demanded €20M. The Rossoneri are looking for a new deputy left-back.
Juventus have several players out on loan, including some with big wages or high price tags, and most of those situations are uncertain.

Juventus Will Have to Sort Future of Multiple Loanees

Juventus have several players out on loan, including some with big wages or high price tags, and most of those situations are uncertain. It’s surely improbable that the Bianconeri will cash in as much as their hoped when the deals initially came to be last summer or beforehand.