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Moore, 35, was removed from his outing against the Toronto Blue Jays on Sunday due to elbow issues. He was 5-3 with a 5.03 ERA in 51 relief appearances this season and is 71-66 with a 4.39 ERA in 369 appearances (164 starts) over 13 seasons with eight different clubs.
Miller, 28, is set make his major league debut after five minor league seasons. He was 5-1 at Salt Lake this season with a 2.45 ERA in 34 appearances (one start).
Trout, 33, already was ruled out for the remainder of the season. The three-time MVP went down with a knee injury one month into the season and came away with a second knee injury while he was on rehab for the first one.