The Blues will aim to build on their performance of high intensity against Stoke on Wednesday, but how Mousinho goes about cajoling another showing from his squad is a big consideration.
With his squad short on depth in terms of quality, the Blues boss has to decide how he can keep his team fresh but also competitive.
Here’s how we think he will go as Pompey aim to cement their place clear of the bottom three at The Hawthorns.
17. Sub 5 Owen Moxon
Interesting to see how thing play out for Moxon this month as playing time he craves eludes him. Photo: Jason Brown
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18. Sub 6 Isaac Hayden
A rest seems the sensible thing for midfielder, given a relatively busy period of action. | Jason Brown/ProSportsImages
19. Sub 7 Harvey Blair
Pompey's one back-up winger at present - and a very raw one still at that. Photo: Jason Brown
20. Sub 8 Christian Saydee
Could well get some meaningful playing time in this one, given the shift put in by his team-mates against Stoke. Photo: Jason Brown