Twenty-three-year-old batsman Dan Redfern has left Derbyshire by mutual agreement.
Redfern came through the county’s academy and made his List A debut in 2006, his first-class bow in 2007 and maiden LV= County Championship appearance the same year.
He became a fairly regular member of the first team over the following seasons, but this year his appearances were limited, in part by injury in the second half of the campaign.
The left-handed batsman made 70 first-class appearances for Derbyshire, scoring 5,958 runs, including two tons, at an average of 29.47. He played in 43 List A and 14 Twenty20 games with less batting success.
Head coach Karl Krikken said: "Dan's been with the club since joining the academy in 2004 and we thank him for his efforts during that period.
"However, in recent times, he's had a number of issues - both on and off the field - which made last season in particular a challenging time for both him and the club.
"While it's always difficult to see players leave, both Dan and the club feel a new challenge is the best route forward."
Redfern, an occasional right-arm off-spinner, said: "I have thoroughly enjoyed my time at Derbyshire and I thank Krikk and the team for their support. The decision to move on is tough but a fresh start will open new opportunities for me in the next stage of my career."