David Wiese will play for Sussex in next year's Vitality Blast as an overseas player.
Wiese, the 35-year-old South African allrounder, has been with Sussex since 2016 on a Kolpak registration, which expires at the end of the year following Britain's exit from the European Union.
"Sussex has been home for the last four seasons and I can't wait to be back," Wiese said. "We have had a fair amount of success in the Blast over the last few seasons, but hopefully we can take it a step further next season."
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Sussex finished second in the South Group behind Surrey this year and were knocked of the competition by Lancashire in the quarter-finals. Wiese enjoyed a strong 2020 Blast season, scoring 281 runs at an average of 40.14, including a career-best 79 not out at Lord's to seal a Sharks victory against Middlesex.
His 171 against Hampshire in the 2019 Royal London Cup remains the highest one-day score in Sussex history.
James Kirtley, the club's newly appointed T20 head coach, said: "It's fantastic news that David will be with us next season for the Blast. It will give us peace of mind knowing that a player of David's class will be available for the whole of the tournament.
"He plays a number of roles for us in our T20 side and he continues to play match-winning innings such as the one at Lord's this season."