Barlow will be sidelined indefinitely after being diagnosed with right shoulder soreness Thursday, Scott Merkin of MLB.com reports.
Fellow reliever Jimmy Lambert is also battling shoulder soreness and is expected to miss 10-to-14 days, while Barlow's absence is expected to be longer. The former Ranger is in camp as a non-roster invitee and could have pitched his way into a prominent role given the uncertainty in the White Sox's bullpen, but now his status is cloudy.