South Africa batsman Stephen Cook can add toughness to Durham's batting order, says head coach Jon Lewis.
South Africa Cricket
Durham sign South Africa batsman Stephen Cook as an overseas player for the first half of the 2017 season.
Glamorgan confirm Jacques Rudolph as captain for 2017, while batsman Colin Ingram is due to return to four-day cricket.
AB de Villiers rules himself out of South Africa's summer Tests in England as he starts "prioritising what I want to achieve".
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How to get into cricket - physical exertion with a chess-like element in matches which range from half an hour to five days.