Afghanistan legspinner Rashid Khan will return to Sussex as the club's T20 overseas player for the 2020 season.
Rashid, who has also worked with Sussex head coach Jason Gillespie at Adelaide Strikers, will be available for the whole of the Blast group stage.
It will be his third stint at the club, following spells in the past two years. In 2018, he took 17 wickets in the group stage before missing the knockout stage, as Sussex lost in the final against Worcestershire, while this summer he managed seven in nine group games.
"I am really happy to be returning to Hove for next year's Blast," Rashid said. "Sussex is like a second home to me and I can't wait to get back and see my team-mates, the staff and all our fantastic supporters."
Gillespie said: "It's absolutely brilliant to have Rash back for a third stint. He's a box-office player that our supporters love and to have the captain of an international team as one of our overseas players is a great honour.
"Rash's schedule was already busy next summer, and it wasn't guaranteed that he would be back with us, so we're really excited and grateful that he's made himself available again.
"Speaking to Rash, I know that a big part of that decision is based on the fact that he's made some great friends at Sussex and that he receives such a warm welcome from everyone at the club - from the players and support staff, to the guys in the office and our superb supporters. Rash loves coming to Hove and we love having him, so it all works very well."
Rashid, 21, was the first pick in the inaugural draft for the Hundred last month, and will be in England for the majority of next summer.
He will be joined in the squad by Travis Head, the club's other overseas player and his Strikers team-mate.