The Rossoneri are having an excellent season but are heavily reliant on the goals of Zlatan Ibrahimovic, who turned 39 in October.
Ibrahimovic has scored 10 times this season, putting the Sweden legend six goals clear of the next highest Milan marksman.
Palace talisman Zaha has been directly involved in 10 goals in only 14 games this season, volleying the opener against the high-flying Foxes at Selhurst Park.
Milan are said to have been impressed by Zaha's switch to a more central position and glut of goals for his low-scoring club.
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