The 20-year-old made 10 appearances for Derbyshire in all forms since making his debut in 2017 against West Indies at The County Ground. He scored 122 runs, with a top-score of 52.
Head of Cricket, Dave Houghton said: “Callum has shown glimpses of his talent, but we feel the time is right for him to pursue opportunities elsewhere.
“We wish Callum the best of luck for the future.”
© Cricket World 2018