The wing-back, reports Tuttosport, feels let down by Milan coach Vincenzo Montella.
The pair spoke several weeks ago about Antonelli's situation, where he was assured he'd be granted playing chances. However, the wing-back remains on the outer.
Indeed, even for the looming Europa League tie with Austria Wien, Antonelli isn't expected to be handed a playing chance.
The defender is now ready to consider offers in January - with Turkey's Antalyaspor already in contact with his minders.