The PCA says it would back two overseas players per club from 2021 to allow Kolpak signings to continue playing county cricket.
Dominic Cork remains as Derbyshire's T20 head coach for the T20 Blast competition in 2020 after signing a new deal.
Essex start their County Championship title defence with a home fixture against Yorkshire in a much-changed schedule in 2020.
Derbyshire wicketkeeper Harvey Hosein extends his stay with the county until the end of the 2022 campaign.
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