Not because of injuries picked up during the 3-2 win against Barnsley on Tuesday night – but because of the partying that ensued after the Blues clinched the League One title against the Tykes.
The group looked energised and ready to go again whenever they reported back for duty on Friday. However, there’s sure to be a few sore heads still rattling around as the players rightly celebrated their achievements this term.
Luckily for Mousinho, his injury list is nowhere near as severe as what it was earlier in the season, with 24 players reporting fit for Tuesday night’s game.
There’s doubts around Zak Swanson and Tino Anjorin – but with Terry Devlin making a welcome return to training on Friday, and Tom Lowery and Ben Stevenson both available for selection, the head coach won’t be short of options.
Saying that, he’ll want to field a strong side for what is the Blues’ last home game of the season, with the League One trophy set to handed to skipper Marlon Pack at the final whistle, too. Pompey also have their eyes set on the 100-points marker, which they’ve never achieved in their history.
So what’s the likely line-up set to look like? Here’s how we think the Blues will line up against the Latics – a game that could also be the last at Fratton Park for one or two.

9. Right-wing: Abu Kamara
The winger looked dead on his feet at times against Barnsley but still looked Pompey's most likely threat. Tne on-loan Norwich man has eight goals and 10 assists from his 44 league games this season. What a signing he's been. Saturday's game will likely be his last at Fratton Park with the star and crescent on his chest. Photo: Jason Brown

10. No10 - Callum Lang
The former Wigan man looks a livewire every time he pulls on a Pompey shirt. He'll no doubt want to be involved from the start against his former side. Photo: Jason Brown

11. Left-wing - Paddy Lane
The Northern Ireland international certainly enjoyed Pompey's promotion party - and why not, he's been an integral part of the team's success this season. Should start unless he's kept the party going! Photo: Jason Brown

12. Striker - Colby Bishop
The striker has had his critics this season - but his response has been superb. With 21 league goals this term, he's just two behind Charlton's Alfie May in the race to be crowned the division's top scorer. He'll be wanting a start to give him the best chance of overtaking the Addicks front man and adding League One's golden boot award to his league winner's medal. Photo: Jason Brown

