AC Milan is working during this transfer market window on many fronts, like bringing new additions, letting go of players, and even contract extensions. Soon, the management will also have to deal with Atalanta who has Caldara on loan as he has not been doing very well recently.
According to the latest information of Tuttosport, these are the months of truth for Mattia Caldara. The defender, on loan from Milan, is finding little space in Gasperini's starting eleven team. If he continues not to play, Atalanta could send him back to Milan at the end of the season.
At that point, he should be put back on the market. An extension of the loan for the defender is also possible. Milan obviously hopes that Atalanta exercises the buy-option.