The Pompey boss is calling the next three fixtures spread across eight days a potentially season-defining period for his side, as they face teams in and around them towards the foot of the table.
Charlton are also talking up the importance of the occasion, after four defeats on the spin as they slip down the Championship after their impressive return to the level.
There’s plenty to consider in terms of suspension, form and Pompey’s hunt for the right dynamic and winning formula. Here’s how Pompey writer, Jordan Cross, thinks Mousinho will go at The Valley.
17. Sub 5: Adrian Segecic
An asset off the bench, if Pompey decided to stiffen things up through the middle of the pitch. | Graham Hunt/ProSportsImages
18. Sub 6 Florian Bianchini
Offered honesty and energy against Millwall, but not bringing nearly enough across his Pompey stay to date. | Paul Phelan/ProSportsImages
19. Sub 7 Conor Chaplin
We're all waiting for his Pompey stay to catch fire and it's possible he could be used instead of Segecic. Photo: Stephen Flynn
20. Sub 8 Minhyeok Yang
Could well be needed to supplement attacking energy off the bench. Photo: Graham Hunt