Posh's inevitable relegation looks set to be confirmed at Oakwell unless they win and Watford lose at home to West Brom, while Gary Johnson is poised to be named as the new manager at London Road in the coming days.
Record signing Bennett missed eight games with an ankle injury but returned as a second-half substitute during the 3-2 defeat to Newcastle on Saturday and could return at the back.
Winger Chris Whelpdale could miss the remainder of the campaign after injuring his ankle in the 1-0 defeat to Bristol City last Saturday while on-loan Wolves full-back Mark Little has a hamstring injury.
Centre-back Craig Morgan is also out with an ankle problem and striker Aaron Mclean is sidelined for the rest of the season after having knee surgery.
