Cagliari President Massimo Cellino has given Milan the green light to sign Andrea Lazzari.
The 26-year-old is Max Allegri's No 1 choice to reinforce his midfield in Janury.
Lazzari worked with Allegri for two years in Sardinia and has a close bond with the Milan boss.
"There is a willingness to negotiate," Cellino said.
"However in my opinion there won't be any particular problems seeing the relationship that I have with a true friend like Milan Vice-President Adriano Galliani.
"If Milan and Lazzari want [the move], then there is no problem. But we need an adequate compensation."
Think you know your Italian football? Share your knowledge, tips and comments to win cash prizes in OLBG's tipster competition  - £5,000 monthly.