The Japan midfielder complained about his treatment while on international duty this week.
"There are quite a lot of players who have not featured yet," Moyes said.
"But if you look at it most of them were late back from international duty after the Confederations Cup, then they were away for a friendly international and a long-haul flight, then they were away again for another international.
"If you look at the reasons why people haven't played, it is more to do with them not being available for that to happen."
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