Cheltenham Town provide the opposition as John Mousinho aims to build on a solid start as boss.
After starting with a preferred 4-3-3 formation, the Blues head coach has switched to a 4-2-3-1 in the past two games.
How he goes about tackling the Robins, who play with a back three will be interesting, as will the players employed.
Here’s how we think Pompey will line up.
1. Pompey predicted line-up
Pompey were victorious at Cheltenham earlier in the season. Photo: Jason Brown
2. GK - Matt Macey
Looking for third clean sheet on the spin and his fifth since joining on loan from Luton. Photo: Jason Brown
3. RB - Joe Rafferty
What a reassuring presence the Scouser has been after putting his Pompey injury hell to bed. Photo: Jason Brown
4. CB - Sean Raggett
Has the captain's armband but is being pushed hard by Di'Shon Bernard. Photo: Jason Brown