Derbyshire sign South Africa fast bowler Hardus Viljoen as a non-overseas Kolpak player on a three-year contract.
The 2017 county fixtures are announced, featuring a full round of day-night Championship matches for the first time.
Derbyshire sign Sri Lanka all-rounder Jeevan Mendis as their overseas player for the first half of next summer.
South Africa leg spinner Imran Tahir will join Derbyshire as an overseas player for all formats from June 2017.
Audio & Video
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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