Division One side Surrey sign Australia all-rounder Mitchell Marsh as their overseas player for 2018.
Teenagers Conor McKerr, Ollie Pope and Amar Virdi extend their contracts with Surrey until the end of the 2020 season.
Derbyshire sign former West Indies seam bowler Ravi Rampaul from Surrey on a three-year contract.
Lancashire finish second in the Championship after taking fewer than six overs to seal a seven-wicket win over Surrey.
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