Brighton will be without goalkeeper Mathew Ryan for the Asia Cup.
He has been called up to represent Australia in the tournament.
Ryan is a part of the Socceroos' 23 man squad for the tournament, which begins next month.
He will miss several Premier League games and an FA Cup clash.
Boss Chris Hughton would not reveal the exact date Ryan must leave.
Hughton joked when asked by The Argus: "I know but you don't! Which means I cannot tell you."