Gloucestershire paceman Dan Worrall will not play again this season because of a back injury.
The 27-year-old Australian made just two appearances after rejoining the county as an overseas signing for 2019.
Worrall overcame a hamstring problem over the winter, but left the field during Gloucestershire’s One-Day Cup tie against Middlesex in April.
After several medical investigations, a stress fracture in Worrall’s back was eventually diagnosed.
Gloucestershire have confirmed they will be seeking an overseas bowler to replace him.