Sussex have announced that head coach Mark Davis has left by mutual consent.
The news comes the day after batsman Chris Nash asked to be released from his contract a year early.
Davis took on the role at Sussex in November 2015, replacing Mark Robinson, and went on to record two fourth-place finishes in Division Two.
Last year and in the season just gone, Sussex struggled in the T20 Blast and One-Day Cup, failing to get out of the group stage in both competitions.
Davis said: "I have established a very strong squad including Jofra Archer, Stiaan van Zyl and Laurie Evans and given opportunity to a number of young players who will no doubt achieve great things in the future.
"The professional squad is very well set for the challenges ahead and I am confident these players will bring silverware to the club. I would like to thank all the players, support staff and coaches who supported me, as well as all the faithful Sussex supporters."
Davis spent four years playing for Sussex before joining the coaching staff.
