Phillies manager Charlie Manuel said Myers would be available out of the bullpen on Friday night, when Philadelphia opened a four-game series at Houston. The 29-year-old had hip surgery on June 4. He was 4-3 with a 4.66 ERA in 10 starts.
The Phillies also delayed the start of Clay Condrey's rehab assignment at Lehigh Valley on Saturday because he's still feeling pain in a strained left oblique muscle.
Condrey (6-2, 3.41 ERA) has been on the DL since July 23.