Barbados-born Collymore is Sussex's leading wicket-taker in the County Championship this term, taking 57 wickets at an average of 19.87.
BBC: Middlesex sign Corey Collymore as Pedro Collins leaves
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He was also the county's leading wicket-taker for the 2009 season, with 46 first-class scalps at an average of 32, including a hat-trick against Sussex.