Maton was optioned to Triple-A Lehigh Valley on Wednesday.
Maton was called up by the Phillies last week after Jean Segura (groin) was placed on the injured list, but he only appeared in one game during his most recent stint in the majors. He should see more consistent at-bats in the minors, while Matt Moore (back) was reinstated from the 10-day injured list in a corresponding move.