Brighton have signed Cameroon international left-back Gaetan Bong on a free transfer after his short-term deal at Wigan Athletic ended in May.
The 27-year-old, who has played top-flight football in France and Greece, has signed a two-year contract.
Manager Chris Hughton said: "Gaetan is a player that we were aware of while he was at Olympiakos in Greece.
"He is very athletic, he is a natural left-sided player and it is important to have that balance in the squad."
Bong began his career with French side Metz and had a brief loan spell with Tours.
After a spell at Valenciennes, he joined Olympiakos in August 2013 and played in four Champions League games.
The defender, who represented his country at the 2010 World Cup, joined Wigan on a free transfer in February.