James Schmehl of MLive.com reported that Nathan seemed to be in pain just ten pitches in to his relief appearance for the Tigers' Triple-A Toledo affiliate.
Nathan later said that he didn't want to speculate on the nature of his injury, but that he felt a "pop."
Joe Nathan will return to Detroit and await further instruction. Felt a "pop," but didn't want to speculate. Said it could be scar tissue.— James Schmehl (@jamesschmehl) April 22, 2015
Earlier this month, Detroit placed Nathan on the 15-day disabled list with a right elbow flexor strain. Nathan had pitched in one game this season for the Tigers before being placed on the DL.
The 40-year-old reliever was expecting to make his return from injury on Friday, according to MLive.com
He is currently in his second season with the Tigers and his 15th season overall.
Nathan had 35 saves, seven blown saves and a 4.81 ERA over 62 games with Detroit last season.
The Tigers are currently 11-3.
- Erick Fernandez