The Italy defender has agreed terms over a new deal, reports Il Corriere dello Sport.
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Mancini's current deal runs to 2027, but he is now set to put pen to paper on a new agreement.
The new arrangement will run to 2029 with an option for another 12 months.
Mancini has firmly established himself as a first-choice for coach Gian Piero Gasperini this season.