They are set to add winger Bernardeschi to their team as well, who has convinced director Giuseppe Marotta to enter negotiations with an initial offer. Although the Viola have set an asking price of €50m, Massimiliano Allegri's side are looking to narrow the gap with bonuses.
The two sides do not have a great relationship, but the presence of the 23-year-old attacker's agent, Beppe Bozzo, could smooth talks.
Bernardeschi is contracted to Fiorentina until June 2019, but is not interested in signing a new contract with the club he joined at the age of nine.
The Italy international, who scored 11 goals in 32 Serie A appearances for Fiorentina, has also attracted interest from Inter and Chelsea.