It's a tough assignment for John Mousinho's side against opposition with one of the best home records in the division.
The Blues are on a nine-game unbeaten run, however, as they aim to move a step closer to the Championship.
Here's how we think Pompey will line up, as they embark on the run-in with 10 games remaining.
17. Sub 5: Josh Martin
Ahead of Scully and Whyte at present - and no reason for that to change at Blackpool. Photo: Jason Brown
18. Sub 6: Christian Saydee
More of the same please from the smiling assassin as and when required! | PA
19. Sub 7: Kusini Yengi
Could he get a start? If not Yengi will have some impact on the game from the bench. Photo: Jason Brown
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