Cristian Zapata is set for surgery on an ankle injury he suffered during the Copa America.
The AC Milan defender played in all five of Colombia s games at the Copa America Centenario last month as they reached the semi-finals before being knocked out by Chile.
In a statement, the Serie A side said: AC Milan announces that, in the course of the Copa America, Cristian Zapata suffered a lesion to the capsular ligament in his left ankle.
After a consultation with professor Niek van Dijk in Amsterdam, the player will have to undergo surgery in the coming days.
Zapata signed for Milan on a permanent basis in 2013 after initially joining on a season-long loan from Villarreal.
The centre-back made 21 appearances last season, scoring one goal.