Moustakas isn't starting Monday's game against San Diego, Charlie Goldsmith of The Cincinnati Enquirer reports.
Moustakas was initially listed in the starting lineup, but after the Reds moved Tyler Naquin (undisclosed) to the injured list, the new lineup did not include the veteran third baseman. It's unclear at this time why Moustakas was scratched from the starting nine, per Mark Sheldon of MLB.com.