The Athletics optioned Rashi to Triple-A Las Vegas on Friday.
The right-hander was called up by the A's on Tuesday after being claimed off waivers and will head to Triple-A after giving up a run across two innings during his team debut Thursday in Kansas City. Rashi has surrendered five earned runs with a 5:3 K:BB over 5.2 frames between the Diamondbacks and Athletics this year.