The Orioles acquired Sanders from the Pirates on Monday in exchange for cash considerations, Roch Kubatko of MASNSports.com reports.
Baltimore transferred Keegan Akin (elbow) from the 15-day injured list to the 60-day IL to free up a spot on the 40-man roster for Sanders, who was subsequently optioned to Triple-A Norfolk. The 29-year-old right-hander had made nine appearances out of the Pittsburgh bullpen this season, posting an 8.68 ERA, 2.04 WHIP and 13:10 K:BB in 9.1 innings.