The Royals reinstated Bubic (elbow) from the 60-day injured list Saturday.
Bubic has been on the injured list all season while working his way back from the Tommy John procedure he underwent last April. In nine rehab appearances with Triple-A Omaha, the 26-year-old lefty posted a 2.63 ERA and 1.22 WHIP over 27.1 innings. He'll transition to the bullpen as he returns to Kansas City and will likely serve in a multi-inning relief role. Walter Pennington was optioned to Omaha in order to make room on the active roster, and Colin Selby was DFA'd to clear a 40-man spot.