Long-serving spinner Will Beer will spend a 12th season as a first-team player at Hove after signing a new contract with Sussex.
Beer, 30, made his debut for the club in 2008, having risen through the club's junior and academy ranks.
A Twenty20 Cup winner in 2009, the leg-spinner has remained a potent weapon in the shortest format, taking two wickets in this year's Vitality Blast final - a defeat to Worcestershire at Edgbaston.
"I have never been as excited to be a Sussex player as I am now and this is testament to the environment that has been created over the past year," said Beer.
"Last year was a great stepping stone to hopefully an even better season in 2019 and hopefully we can reward the Sussex faithful with a trophy or two.
"On a personal level, last season was full of ups and downs, with injury preventing me from playing a part in our 50-over campaign but representing Sussex in the T20 final has to be the highlight."
Of Sussex's most prolific T20 bowler, head coach Jason Gillespie said: "Although opportunities were a bit limited for him last year with injury and the make-up of the side, his attitude around the team was outstanding and when he did play, he stepped up and did a fine job."
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