Wallace and Devera start at Proact Stadium
Jed Wallace returns to the Pompey side at league leaders Chesterfield this evening.
The other change from the side that beat Accrington last Tuesday sees the fit-again Joe Devera come in at right-back.
Daniel Alfei and Michael Drennan are both away on under-21 international duty with Wales and Republic of Ireland respectively.
Andy Barcham is also unavailable after his wife gave birth to a baby boy last night.
Pompey: Carson; Devera, N’Gala, Chorley (c), Shorey; Diagouraga; Wallace, Padovani, Fogden, Holmes; Jervis
Subs: Smith, Bradley, Painter, Ertl, Racon, Harris, Agyemang