Bailey had been out since April 29 with right biceps inflammation. He threw 17 pitches in a rehab assignment Saturday at Triple-A Pawtucket.
"Obviously, this is where you want to be," Bailey said. "Healthy, and with the team. Just looking forward to getting back out there."
Bailey last pitched April 28 against Houston when he threw a scoreless inning. He's 1-0 with a 1.46 ERA and five saves. His return comes at a good time for the Red Sox, who have lost fellow reliever Joel Hanrahan for the season with an elbow injury. Boston optioned reliever Jose De La Torre to Triple-A Pawtucket to make room.
"I feel 100 per cent, ready to go," Bailey said. "If there wasn't any issues I wouldn't be here and that's behind me. I got my one outing in and I'm ready to go."