The Milan captain is inside the final 18 months of his current deal and negotiations over a new contract have stalled.
With Gigio Donnarumma coming off contract in June, Milan do not want a repeat case involving Romagnoli.
As such, Milan will put the defender up for sale this summer if new terms cannot be settled, reports TMW.
Romagnoli's agents are already sounding out interested clubs, including Barcelona, with the Milan captain yet to start a game since March 7.
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