The Blues have been held to frustrating goalless draws with Shrewsbury and Rochdale in their opening games of the campaign.
Kenny Jackett now has to ponder his starting line-up to deliver three points against the Latics.
Here's how we think the Blues could line-up...
1. Goalkeeper - Craig MacGillivray
A formality with Alex Bass injured, although the Scot has been in top form after coming back into the side. Photo: Joe Pepler
2. Right-back - Callum Johnson
Unlucky not to have got an assist against Rochdale and Pompey will be looking for more dangerous deliveries from him. Photo: Joe Pepler
3. Centre-back - Jack Whatmough
Surely first-choice central defender now given the superb way he’s started the season. His knee injury (touch wood) has given him no problems so far. Photo: Joe Pepler
4. Centre-back - Sean Raggett
The arrival of Rasmus Nicolaisen has put Raggett’s place under threat, but after two clean sheets in the league it’d be harsh for him to be dropped immediately. Photo: PinPeP