Sussex have not offered new contracts to Ragheb Aga, Chad Keegan or Michael Thornely and the three players are set to leave the club.
Former Kenyan international Aga, 26, made his debut for Sussex in late 2007, last playing for them in a CB40 game against Surrey in August.
Fast bowler Keegan, 31, joined Sussex in 2009 having previously played for Middlesex between 2001 and 2007 and battled back from injury to play a key part in Sussex's one-day cricket in the last two years.
22-year-old batsman Michael Thornely is a graduate of Sussex's academy who made his first-class debut in 2007.
“I would like to thank Ragheb, Chad and Michael on all they have given us during their time at Sussex. All three players have always given 100% and have been fine ambassadors for the club, and we would like to wish them all the best for the future," Pro Cricket Manager at Sussex, Mark Robinson said.
Sussex sealed an immediate return to the top flight of Championship cricket by winning Division Two and have signed Kent fast bowler Amjad Khan as they build for 2011.
© Cricket World 2010