James Anderson tore his groin muscle in last week's Roses match and will be assessed by England's medical staff on Wednesday.
Marcus Trescothick hit a club record 50th first-class century for Somerset as they drew with Warwickshire in Taunton.
Hampshire slumped to 18-5 - losing five wickets for no runs in 17 balls - as Essex ran riot in their Specsavers County Championship match.
James Anderson is unlikely to bowl again in Lancashire's Specsavers County Championship clash with Yorkshire.
James Anderson had to leave the field with a suspected groin injury on the first morning of the Roses match.
Alastair Cook continued his outstanding early-season form while there was an injury scare for James Anderson.
Worcestershire beat Derbyshire to claim top spot in the North Group and clinch a home semi-final in the RL One-Day Cup.
Colin Ingram hit a third hundred for Glamorgan in the Royal London One-Day Cup in their 15-run win over Kent.
James Vince's 178 for Hampshire proved in vain as they slipped to a three-wicket defeat to Glamorgan in the RL One-Day Cup.
Alastair Cook's century helped Essex to a tense 10-run victory over Sussex in the RL One-Day Cup despite a Jerome Taylor hat-trick.
Lancashire have signed Sri Lanka batsman Mahela Jayawardene for the 2017 NatWest T20 Blast.
Lancashire won their first game of the Royal London One-Day Cup as Steven Croft's stunning 127 helped them beat Warwickshire.
Billy Root's maiden limited-overs century helped Nottinghamshire to a 10-run Royal London One-Day Cup win over Warwickshire.
Yorkshire earned a convincing 79-run win over Roses rivals Lancashire in the Royal London One-Day Cup at Headingley.
Promising legspinner Mason Crane "needs to play" and might have to move county, says Sky Sports' Nasser Hussain.
Rob Key previews the Royal London One-Day Cup with Warwickshire looking to defend their crown as the white-ball season begins.
Lancashire clinched a comeback win over Somerset on day four of their County Championship clash, skittling the visitors for 130.
The 2017 Royal London One-Day Cup starts on Thursday, test your knowledge on the tournament with our 10-question quiz...
Liam Livingstone starred for Lancashire while Gary Ballance held Hampshire up in their County Championship Division One victory bid.
Joe Root and Jonny Bairstow registered single-figure scores as Yorkshire's top order capitulated against Hampshire at the Ageas Bowl.