Oxspring is expected to be moved somehow to make room for right-handed relief prospect Jose Ortega, who may be activated from the disabled list and rejoin the Mud Hens bullpen as soon as Tuesday.
Oxspring had a 6.53 ERA over 20 2/3 innings of relief, but seven of his 15 earned runs had come in his last two outings. He has pitched only once in the last two weeks, and made another appearance as a pinch-runner for Victor Martinez during his rehab assignment. He spent Spring Training in Major League camp with the Tigers as a non-roster invitee.
Oxspring could return to the Far East; he has pitched in Japan and South Korea in past seasons before undergoing Tommy John surgery last year.