Former Blues boss Steve Cotterill lies in waits with five games of the League One season remaining.
His side had won their five past home games on the spin, before defeat to Peterborough last time out.
So a tough test lies in wait for John Mousinho’s side, with play-off hopes receding going into the game.
Pompey have fitness and suspension issues to consider going into the game – so this is how we think they will line up at New Meadow.
17. SUB Dane Scarlett
Didn't take his chance on Monday. Hopefully he can do so if used off the bench at New Meadow. Photo: Jason Brown
18. SUB Joe Pigott
Could well start behind Colby Bishop, but if not a real asset to be able to throw on and shake the game up. Photo: Simon Davies
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