Rabiot's current agreement runs until 2028 with an option for a further year, but Milan want to extend that commitment beyond the existing terms and establish the Frenchman as a central part of the club's long-term plans.
Cardinale is expected to return to Milan in the first half of October and intends to begin discussions with Rabiot soon afterwards. The precise financial and contractual terms have yet to be established, but the club's position is clear: it wants to keep the midfielder.
The decision reflects Rabiot's importance since joining the club. The France international has already demonstrated his ability to operate in several midfield and attacking roles, playing as a holding midfielder, deep playmaker, No 8 and further forward.
His performances have also been accompanied by a clear indication that he is happy with life at Milan.
"I never thought about leaving Milan, I'm happy here."
Rabiot's celebrations after scoring against Torino and Lecce have further underlined his connection with the club and the confidence he currently feels within the team.
That has strengthened Milan's determination to reach an agreement.
Rabiot's mother, Veronique, continues to represent him and has remained relatively quiet during the recent period. The next move is therefore expected to come from Milan, with Cardinale preparing to start the conversation directly.
The club's preference is to secure a longer commitment before the midfielder's existing deal enters its final stages.
Rabiot has quickly become one of the senior figures in the squad, while his versatility has given the coaching staff an option capable of filling several roles depending on the demands of a match.
AC Milan therefore see the renewal as more than a routine contract negotiation.
They want to retain a player who has already established himself as one of the key figures in the current project, and the first discussions are expected to begin within the next few weeks.