Valdez is out of the lineup for Tuesday's game against Atlanta, Chris Cotillo of The Springfield Republican reports.
The 25-year-old is expected to serve as Boston's primary second baseman against right-handing pitching due to Vaughn Grissom (hamstring) and Romy Gonzalez (hamstring) being sidelined, but Valdez will sit Tuesday as lefty Max Fried takes the mound for Atlanta.