Durbin left Wednesday night's game against the Indians after he was injured attempting to field a bunt from Cleveland's Anderson Hernandez leading off the ninth inning. The Phillies purchased the contract of Nelson Figueroa to take his spot on Thursday.
Durbin said after game that he didn't "blow out" the hamstring. The 32-year-old is 0-1 with a 3.31 ERA in 29 appearances this season, holding opponents to a .237 average.
Philadelphia's bullpen has been hit by injuries this season. Closer Brad Lidge missed nearly two months with right elbow inflammation and Ryan Madson is out with a broken toe, though he participated in fielding drills this week.