Song was removed from Thursday's Cactus League game against the Mariners with right oblique tightness, AJ Cassavell of MLB.com reports.
Manager Craig Stammen said after Thursday's contest that Song's removal was precautionary, as the Padres didn't want to risk further damage to the 29-year-old's oblique, which he originally injured in January. Song may take a break from Cactus League action for a couple days, but his Opening Day availability doesn't currently seem to be at risk.