The England Under-21 international missed the 2-2 draw at Barnsley on Monday with a thigh injury but is expected to be fit enough to start against the Foxes as Posh start rebuilding for next season.
The point at Oakwell confirmed their relegation and Johnson has been appointed to lead them out of League One next season.
Midfielder Charlie Lee should also be back after a hamstring injury but Johnson is without a host of players.
Forward Reuben Reid has returned to West Brom at the end of his loan spell while fellow strikers Aaron Mclean (knee), Izale McLeod (knee) and Liam Dickinson (hamstring) are all out.
Winger Chris Whelpdale (ankle) and defender Mark Little (hamstring) are also out so Danny Mills and Romone McCrae will hope to be involved after being given their debuts by Jim Gannon last time out.