Manager Davey Johnson said he should have monitored Zimmerman closely after he came off the disabled list earlier this month because of the same issues.
"After the 17 days he was off, generally, I would want to give him some time off in there rather than push it," Johnson said. "But he is so valuable to the ballclub that I didn't even want to go there. But as I told him the other day, we are in a long war. We can miss a battle here, let's make sure that we are around for most of them."