Peters has a quad injury, Johnson has a knee sprain and Barbre's injury is unknown. Linebackers Mychal Kendricks and Kiko Alonso, cornerback Byron Maxwell and reserve defensive lineman Brandon Bair also sat out.
Alonso had knee surgery last week and will be out for a while. Kendricks missed a game with a hamstring injury and was re-injured against the Redskins. Maxwell (quad) and Bair (groin) left early in the loss at Washington.
The Eagles (1-3) host New Orleans (1-3) on Sunday.
AP NFL website: www.pro32.ap.org