Pomeranz (lat) threw a bullpen session Thursday, MLB.com reports.
The left-hander's bullpen session represents a major step toward a return as it marks his first such session since he experienced a setback in his recovery in late May. Manager Jayce Tingler indicated that Pomeranz will throw at least one more bullpen session before facing live hitters, and it is uncertain whether he will need a rehab stint before returning to the big club. He remains unlikely to rejoin the big club until early July.