Striker Benson lost his appeal against his sending off in the closing stages of the Addicks` 3-3 draw with Colchester which allowed him to play in the home defeat to Swindon on Bank Holiday Monday.
However, young defender Matt Fry is available after he extended his loan from West Ham for another month.
Peacock was appointed caretaker manager following the sacking of Phil Parkinson on Tuesday in the wake of the heavy 4-2 defeat to the Robins.
Source: PA
Source: PA