Eldridge isn't in the lineup for Tuesday's game against the Rangers due to a bruised left thumb, Alex Pavlovic of NBC Sports Bay Area reports.
Eldridge said he suffered the bruise after getting jammed a couple of times last week, and the injury also helps to explain why he was absent from Monday's lineup. He'll be available to serve as a pinch runner Tuesday and is expected to return to the starting nine in Wednesday's series finale. In the meantime, Buddy Kennedy will serve as San Francisco's DH and bat sixth.