England could be without their two leading bowlers for the second Test against India at Lord's starting on Thursday after James Anderson joined Stuart Broad in missing Wednesday's final pre-match practice session.
Broad suffered a calf problem after pulling up during Tuesday's warm-up and a thigh injury prevented Anderson taking part in Wednesday's net session.
England have not played a Test without either one of the pair since October 2016.
Lancashire's Saqib Mahmood was added to the squad on Wednesday fresh from playing in the Hundred for the Oval Invincibles.
Mahmood, 24, is uncapped at Test level but was named man of the series during the recent one-day internationals against Pakistan after taking nine wickets in three games.
He is the second additional call-up to the England squad following the inclusion of off-spinning all-rounder Moeen Ali.
England could make several changes for to a side that was largely outplayed in a rain-affected clash in Nottingham -- the first of a five-match series.
Meanwhile, England and India have both lost two World Test Championship points and each been fined 40 percent of their match fees for maintaining a slow over-rate in the series opener at Nottingham, the International Cricket Council announced on Wednesday.
A rain-marred fixtures at Trent Bridge ended in a draw after the whole of Sunday's last day was washed out.