Derbyshire captain Billy Godleman signs a new contract which keeps him at the club until the end of the 2019 season.
Batsman Neil Broom seems set to leave Derbyshire a year before his deal ends after being recalled by New Zealand.
Former England international Mal Loye joins Derbyshire as their new development coach.
Derbyshire sign South Africa fast bowler Hardus Viljoen as a non-overseas Kolpak player on a three-year contract.
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Derbyshire teenager Matthew Critchley tells BBC Radio Derby remained relatively calm as he closed in on a maiden first-class century.
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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.