Mark Prior is scheduled to throw an inning of relief on Thursday in a Grapefruit League game.
Reds signed RHP Mark Prior to a minor league contract.
Red Sox released RHP Mark Prior.
Mark Prior has struck out 36 but walked 21 in 23 innings for Triple-A Pawtucket this season.
Mark Prior (oblique) is scheduled to face live hitters Tuesday.
Mark Prior was placed on Triple-A Pawtucket's disabled list over the weekend due to an injury to his side.
Mark Prior allowed his first two runs for Triple-A Pawtucket on Monday, but also recorded four strikeouts in 1 1/3 innings of work.
The Red Sox have promoted Mark Prior to Triple-A Pawtucket.
Jon Heyman of CBSSports.com reports that the Red Sox will sign right-hander Mark Prior.
Nick Cafardo of the Boston Globe reports that Mark Prior will be ready to throw for teams soon.
Chris Young told reporters Wednesday that Mark Prior is ready to sign with a team.
Mark Prior is expected to "attempt one more comeback," according to Nick Cafardo of the Boston Globe.
Mark Prior was scratched from an appearance with the Gulf Coast League Yankees on Wednesday due to shoulder discomfort.
Mark Prior suffered a bruised left forearm Wednesday when he was struck by a batting practice ball.