Pakistan pace bowler Mohammad Abbas joins Nottinghamshire for their first nine County Championship games of 2020.
Leicestershire slow left-arm spinner Callum Parkinson signs a new contract, tying him to Grace Road until 2021.
Essex start their County Championship title defence with a home fixture against Yorkshire in a much-changed schedule in 2020.
All-rounder Colin Ackermann signs a three-year extension with Leicestershire, which will expires at the end of 2023.
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