Imran Tahir will feature for a record seventh county when he makes his Durham debut next week.
The veteran South Africa leg-spinner is to make his Jets bow in their Vitality Blast opener against Yorkshire at Headingley on Thursday and will surpass the six counties represented by Australian batsman Marcus North and Pakistani white-ball specialist Yasir Arafat.
The 39-year-old was not expected to be available for a county stint this summer due to his country's imminent tour of Sri Lanka.
However, with his place at next year's World Cup seemingly assured, South Africa selected left-arm spinners Tabraiz Shamsi and Keshav Maharaj on that trip instead.
It allowed Durham to recruit the former number one-ranked Twenty20 bowler as their second overseas player in addition to New Zealand batsman Tom Latham.
Tahir, who claimed the Indian Premier League title with Chennai Super Kings earlier this year, previously played for Nottinghamshire, Hampshire, Warwickshire, Yorkshire and Middlesex.
"I always enjoy playing in England and hope that my previous international and county experience can help make an impact," he said.
Durham head coach Jon Lewis added: "We wanted to invest in a top-quality player to improve our white-ball squad and we feel that Imran demonstrates our ambition to compete in the T20 format.
"We were keen to strengthen our squad with an experienced big-game player, who will also be able to help our talented youngsters and look forward to welcoming him to Emirates Riverside.
"He is one of the best leg spinners in the world and will bring a different dimension to our game."
Durham are 1212/1 to win the Vitality Blast this year while Yorkshire can be backed at 1212/1.
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