Pompey will be looking to rediscover the form that took them to the League One summit when they host Leyton Orient on Saturday (3pm kick-off).
John Mousinho’s have won just one of their past five games to see the gap to the chasing pack shrink.
The side trying to stop them from getting back on track are the reigning League Two champions, who are currently sitting comfortably in 12th position.
It took a while for the Londoners to adapt to life at a higher level, as they took a single point from the opening four games.
But they have improved under Richie Wellens since then and are a comfortable nine points clear of the drop zone.
He brings the side to the south coast on the back of a 2-0 victory at Cambridge in their last outing on New Year’s Day.
Goals from Jordan Brown and Dan Agyei early in the second half ensured Orient started 2024 on a positive note.
Pompey won 4-0 when the sides met in the reverse fixture back in August, while they also triumphed 2-1 in a Bristol Street Motors Trophy group stage fixture.
But you have to go back to the 2016/17 title-winning campaign to find the last clash at Fratton Park, when Conor Chaplin’s brace saw the hosts collect all three points.
Manchester City loanee Alex Robertson is likely to miss the rest of the season after tearing his hamstring.
Tino Anjorin (hamstring), Josh Dockerill (knee), Connor Ogilvie (ankle), Regan Poole (knee) and Zak Swanson (groin) also remain sidelined.
And Kusini Yengi is currently unavailable after joining up with the Australia squad for the AFC Asian Cup.
Leyton Orient can no longer call upon the services of Brandon Cooper, who has returned to parent club Swansea, but former Fratton loanee Joe Pigott could feature.
HEAD TO HEAD
Pompey: 19 wins
Leyton Orient: 13 wins
At Fratton Park
Pompey: 10 wins
Leyton Orient: 5 wins
Seats have sold out in the home areas of the ground, including those that were made available in the Milton End, but keep checking until 11.59pm this evening to see if any are available via the ticket exchange.
If you are coming to the game, click here to read our matchday guide and find out what is happening around the ground.
Referee: Benjamin Speedie
Assistants: Leigh Crowhurst and Scott Williams
Fourth Official: Michael Webb
Overseas subscribers and match pass holders can watch all the action live, with four-camera coverage, replays and accompanying commentary.
There will be post-match reaction on the website and our official YouTube channel, with highlights to follow on Sunday.
ALSO IN LEAGUE ONE
Games kick-off at 3pm unless stated
Barnsley v Bristol Rovers
Blackpool v Exeter
Bolton v Cheltenham
Cambridge v Fleetwood
Carlisle v Oxford
Charlton v Peterborough
Northampton v Wigan
Reading v Port Vale
Shrewsbury v Stevenage
Wycombe v Lincoln
Derby v Burton (8pm)
LAST FRATTON MEETING