Tuttosport reports that the Colombian defender is one of three names on a list of right-backs on Milan's radar. For Simeone, Arias is a key member of the squad.
Santiago Arias is one of three right-backs who AC Milan have listed as possible reinforcements for next year.
According to Tuttosport, the Atlético de Madrid defender has caught their eye in the three league games he has played so far this season.
The other two names which appear on Milan's list are Lille's Zeki Celik and Tottenham's Serge Aurier.
Arias, 27, was voted the best right-back in the Dutch league in 2017-18 when he was still on the books at PSV - one year before he signed for Atleti.
Milan are keeping a close watch on him but El Cholo knows there will be a time when he will need to call on both of his right-back between now and May.