England Test captain Ben Stokes was carried off the field after sustaining an apparent hamstring injury while playing for the Northern Superchargers in The Hundred.
Stokes was batting for the Superchargers in their match with Manchester Originals at Old Trafford on Sunday when he pulled up after running a single.
England are set to begin a three-match Test series against Sri Lanka at Old Trafford on August 21.
The 33-year-old Stokes was in visible pain while being attended to by physios, punching his leg in frustration.
He was ultimately carried off the field, before being wheeled into the pavilion on a gurney.
Should he be unavailable for England duty in the coming weeks, vice-captain Ollie Pope would be likely to step up and captain the side.
Stokes appeared to have returned to full fitness this summer after recovering from surgery on a knee injury that had limited his ability to bowl.
He opted out of the Indian Premier League and T20 World Cup to assist with his recovery, then led England to a 3-0 series victory over the West Indies, taking five wickets at 34.20 in three Tests.