Opening batsman Paul Borrington has left Derbyshire CCC after the club elected not to offer a new contract for next season.
To date, the 26-year-old has played 49 first-class matches and scored more than 2,000 runs.
He has opted to leave with immediate effect in order to look for opportunities elsewhere.
Elite performance director Graeme Welch said: “Paul has been with the club for a long time and is a popular player among the lads, so it’s sad to see him go.
“However, we have to move on and I speak for everyone at the club when I wish the lad all the very best for the future.”
Meanwhile, fast bowler Mark Turner has also left after the club elected not to offer a new contract for next season.
The 29-year-old arrived at The 3aaa County Ground in 2011 and has since played 21 first-class matches, taking 43 wickets at an average of 44.25.
The former Durham and Somerset fast-bowler made 41 appearances in limited-overs formats, adding a further 49 dismissals.
Turner has joined Northamptonshire for the remainder of the season.
Elite performance director Graeme Welch said: “It’s sad to see Mark go because he’s been a terrific character to have around and a really positive influence on the field and in the dressing room.
“Thank you to him for his efforts and we all wish him all the best. Meanwhile, we’re continuing to work hard behind the scenes to build a winning squad for 2015.”