And the big challenge for the Blues will be filling the huge void left by Alex Robertson’s season-ending hamstring injury.
Last week it was Gavin Whyte who got the nod to play in the 10 role in the 4-2-3-1 formation favoured by John Mousinsho this term.
Here’s how we think he will go as Leyton Orient arrive at PO4.
13. Sub 1: Matt Macey
Signing not yet announced, but training with Pompey today and we're anticipating the noon deadline to register paperwork with the EFL in order to feature the next day has been met. Photo: Eddie Keogh
14. Sub 2: Ryley Towler
Going nowhere this month and could yet have a big role to play this season. Photo: Jason Brown
15. Sub 3: Terry Devlin
Every chance he could play at the front end of midfield - very tight call whether the Glentoran arrival gets the nod and Saydee is used as an impact sub. Photo: Jason Brown
16. Sub 4: Tom Lowery
A welcome addition to Pompey's bench with the season now hopefully ahead of midfielder. Photo: Jason Brown