Boss Michael Appleton, who gave debuts to 11 players in Saturday's 1-1 draw with Bournemouth, is due to bring in winger Jordan Obita on a month's loan from Reading.
And Appleton is also hoping to receive international clearance to sign midfielder Liam Walker in time for the match.
Walker earned himself a trial with Pompey after impressing while playing against them for Gibraltar during the club's pre-season tour of Spain.
It means Appleton's squad is now up to 17, so he will almost be able to fill the substitutes' bench.
Former Barnet striker Izale McLeod continues in attack after his debut goal against the Cherries.
- Michael Appleton
- Jordan Obita