Essex fast bowler Sam Cook has signed a two-year contract extension with the county champions, tying him to Chelmsford until 2022.
Right-arm seamer Cook, 22, has taken 87 wickets in 29 matches since making his first-class debut with Essex in 2016.
"Sam has become extremely reliable and consistent and is a vital part of our side," said head coach Anthony McGrath.
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"He is a fantastic bowler who played a big role in our success last year."
Cook said: "Committing my future to the club was an easy decision and is the perfect way to end a perfect season. We have a determined dressing room full of players that want to build on our success."