Robin Martin-Jenkins became the latest addition to Sussex's injury list yesterday.
The all-rounder was only able to deliver 5.1 overs at Edgbaston because of a side strain and will not bowl again in the rest of Warwickshire's first innings.
Coach Peter Moores said: "It is a bit of a worry because if it gets worse he could be out for the rest of the season. He is going to have intensive physio and hopefully we can nurse him through."
The absence of Martin-Jenkins is a blow to an attack already without James Kirtley and Mark Davis, who have broken hands, and Paul Hutchison, recovering from shin splints.
Skipper Chris Adams (calf strain) and Michael Yardy (knee ligament strain) are also out of the match at Edgbaston.
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