The Athletics optioned Kolarek to their alternate training site Monday.

Kolarek was demoted to clear a spot in the bullpen for Mike Fiers (hip), who is expected to work in long relief after being activated from the 10-day injured list. Acquired from the Dodgers in February, Kolarek has endured a tough start to his tenure in Oakland, posting an 8.44 ERA and 1.88 WHIP through his first eight outings with his new team.

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