Pompey travel to Peterborough tomorrow with the stakes high in the League One promotion showdown.
Mousinho has fitness and injury issues to contend with, as he's tasked with blunting the division's more potent attacking force.
And then there is the big talking point of who starts up front out of Kusini Yengi and Colby Bishop?
What does Mousinho do in terms of formation, too, after switching to a back three against Burton on Tuesday night?
Here's how we think the Pompey boss will go against Darren Ferguson's side.
1. Pompey predicted line-up
Huge Pompey calls to make at Peterborough | Jason Brown/ProSportsImages
2. GK Will Norris
Out to make a strong impression on return to old stomping ground. | Graham Hunt/ProSportsImages
3. RB Joe Rafferty
Most likely a return to right-back as we anticipate a return to a 4-2-3-1 formation at London Road, but shown he can operate in a central three if required. | National World
4. CB Sean Raggett
Huge afternoon for the long-serving defender, likely up against Jones and Peterborough's pace in wide areas. | National World