Bummer was placed on the injured list Wednesday with a strained right hamstring, retroactive to June 28.

It's not clear how or when Bummer injured his hamstring, but the left-hander last pitched Sunday against the Mariners. Per James Fegan of The Athletic, manager Tony La Russa said that Bummer's time on the injured list is expected to be in the 10-day range. Michael Kopech (hamstring) was reinstated from the 10-day IL in a corresponding roster move.

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