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.
5. CB Regan Poole
Is set to be the only remaining league ever-present this season, with Andre Dozzell serving a suspension in the capital. | Graham Hunt/ProSportsImages
6. LB: Zak Swanson
Form has been decent and one of the only players to escape the Bristol City disappointment without his standing taking a hit. | Paul Phelan/ProSportsImages
7. CM Marlon Pack
Moments of quality last weekend but Pompey were overran in the middle and Mousinho will surely take note of that. Nous and a bit of edge will be needed, though, and Pack offers that, though Devlin provides a viable alternative as even does out-of-favor Le Roux with the Blues clearly hunting for the right midfield formula. | Dennis Goodwin/ProSportsImages
8. CM Mark Kosznovszky
The most likely replacement for the suspended Andre Dozzell. Pompey struggled centrally against Bristol City and the Hungarian's legs will be an asset. Photo: Simon Roe