England all-rounder Ben Stokes is an injury doubt for the second one-day international against South Africa in Southampton on Saturday.
The 25-year-old injured his knee in Wednesday's 72-run victory over the tourists at Headingley.
Stokes made 25 runs in the first ODI before being injured , as South Africa chased England's 339-6.
He bowled two overs - conceding 14 runs - before leaving the field for treatment.
He did returned to the field but "was not fit enough to bowl", according to captain Eoin Morgan.