Feliz, who was battling a bulging disk in his lower back, was placed on the disabled list on July 29. He was sent on a rehabilitation assignment on Sunday, and hit two home runs that day for Double-A Reading.
Feliz was hitting .256 with 12 homers and 46 RBIs with the Phillies this season.
Walrond was 0-1 with a 7.11 ERA in four relief appearances.