The Athletics claimed Rashi off waivers from the Twins on Sunday and optioned him to Triple-A Las Vegas.
The right-hander was designated for assignment by the Twins on Friday and will now take on a 40-man roster spot with a new organization. Rashi started the season with Arizona, surrendering four earned runs in three big-league appearances. He's seen the bulk of his action at the Triple-A level, registering a 2.49 ERA, 1.25 WHIP and 49:21 K:BB over 43.1 innings.