England seamer James Anderson was a conspicuous absentee on the second morning of Lancashire's County Championship clash with Somerset, receiving treatment for a "minor issue".

Anderson was in outstanding form on the opening day at Old Trafford, taking 2-16 from 14 metronomic overs but left the field shortly before rain brought an early end to proceedings on Thursday.

He did not emerge with his teammates on Friday, with Lancashire confirming he was experiencing an undisclosed complaint.

"Jimmy is off the field with a minor issue, which is currently being assessed," an official said.

Anderson, 40, is integral to England's Ashes plans, with bowling stocks already hit by fresh injuries to pace pair Jofra Archer and Olly Stone.

Archer has returned early from the Indian Premier League due to discomfort in his troublesome right elbow, while Stone faces several weeks on the sidelines after injuring his hamstring on duty for Nottinghamshire last week.

Anderson managed just four overs in the last home series against Australia, ruled out with a calf problem on the opening morning.

England begin their Test summer against Ireland at Lord's, a four-day match starting on June 1, before the Ashes opener at Edgbaston on June 16.