Essex have dropped Monty Panesar for the County Championship match against Derbyshire because of poor form.
The England spinner, dropped by Essex last month for breaking "timekeeping" rules, has taken 23 wickets in nine Championship matches.
Since returning, he has claimed only four wickets in three games and Essex head coach Paul Grayson believes Panesar needs to regain confidence.
"Monty Panesar has been left out on current form," said Grayson.
The 32-year-old last played for England in the Boxing Day Ashes Test defeat by Australia last year.
It has been a troubled 12 months for Panesar, who was fined by police for urinating on nightclub bouncers in August 2013.
He joined Essex on loan later that month, before signing a two-year deal at the County Ground in October following his release by Sussex.
Panesar, along with former England Lions batsman Ben Foakes, will play no part in the Division Two match at Chesterfield, which started on Monday.
Essex beat Gloucestershire by 10 wickets last week, with Panesar returning match figures of 1-81.
Grayson added: "Monty Panesar and Ben Foakes need to go and play some second-team cricket and get a bit of confidence back again.
"The squad has been selected on the basis of trying to win against Derbyshire.
"We want competition for places and, even though we won last week, we still feel it's right to make these changes."