Coulombe was optioned to Triple-A Nashville on Thursday.

The Athletics need some fresh bullpen arms after Wednesday's starter, Paul Blackburn, recorded just four outs, so Coulombe will swap places with right-hander Carlos Ramirez, who was recalled from Nashville in a corresponding roster move. Coulombe owns a 4.70 ERA and 25:11 K:BB across 23 innings this season. He should be back up when a fresh reliever is needed next.

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