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Herrera (concussion) has been placed on Triple-A Louisville's DL, the Cincinnati Enquirer reports.

As always with concussions, there's no return date set in stone yet. As mentioned by Enquirer writer Zach Buchanan, Herrera is out of options after this season, so if he can recover from this concussion look for him to get more than a September callup, just so that the Reds can get a better idea of whether to keep him on the 40-man roster.

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