The France midfielder is off contract at the end of the season.
Tardelli told TMW: "For (Max) Allegri it seems that Rabiot is indispensable.
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"And it seems to me he has shown that he is important for the team. But then it will depend on who is on the bench."
He also said: "The feeling that (Fede) Chiesa performs better in the national team than Juve? No, he's playing well, he's returning, let's keep our fingers crossed that he doesn't suffer any more injuries."