PREVIEW: New striker could be on view at the ABAX in two-hour friendly
Marriott, a summer signing from Luton Town, and midfielder Harry Anderson are both expected to make their first appearances of the season after recovering from slight injuries.
Posh have scored nine goals in two friendlies without Marriott, albeit against non-league opposition.
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Hide AdFormer Posh striker Conor Washington is expected to be in the QPR squad. Posh will include midfielder Michael Doughty, a player signed from QPR last month.
Posh midfielder Gwion Edwards faces a late fitness test.
Posh and QPR have agreed to play a 120-minute match split into four 30-minute periods.