Asher was placed on the disabled list at Triple-A Lehigh Valley on Friday with a lower calf contusion, Andrew Kulp of CSN Philadelphia reports. The move was retroactive to May 18.
Asher suffered the injury when he was hit in the leg by a batted ball toward the end of his last start. He has been pitching well since returning to Triple-A at the end of April. He is 3-0 with a 1.53 ERA and a 19:3 K:BB in 29.1 innings for Lehigh Valley.