The Blues are out to make it 27 League One games unbeaten, but face an opponent who’ve won 10 of their last 11 visits to Fratton Park.
It appears something has to give with John Mousinho having injury and selection issues to contend with going into the game.
This is how we think he’ll go as he welcomes former Pompey boss Michael Appleton’s side to PO4.
17. Sub 6: Gavin Whyte
Some real glimpses of Whyte's capabilities against Orient on Tuesday night. Could well start on the left - or even in the 10 position. Photo: Jason Brown
18. Subs 7: Kusini Yengi
Confidence is flowing and had an Australia international call-up to lift his spirits further. Two assists on Tuesday and a potential gamechanger off the bench. Photo: Jason Brown
5 / 5