One win from the past seven league games has hampered Pompey’s progress.
But Kenny Jackett still believes his troops can finish the season strongly to claim a place in the play-offs.
Despite that spell of stuttering form, they are still just four points adrift of sixth-placed Bradford ahead of Saturday’s trip to Southend.
Their opponents have not lost since Chris Powell replaced Phil Brown as manager last month, though, and Jackett knows they will provide a stern test.
The Blues boss said: “We’ve flirted with the play-offs for most of the season and have been chasing the top six.
“And that’s where we are now – there is still 100 per cent an opportunity for us to get there if we can put a run together.
"If we aspire to get into the play-off places then we have to look to pick up points against everybody."
“I don’t think it’s been the case that we’ve really stamped our authority on this division, but we have definitely been more than competitive.
“Now it’s a second away game in a row against a side who have recently changed their manager and they’ve had some very good recent results.
“It was a tight match at Fratton Park earlier in the season and we just edged it. I’m expecting something similar on Saturday.
“There are no easy games in this division – I know it’s a cliché, but it’s certainly true. You have to be ready to adapt.
“But if we aspire to get into the play-off places then we have to look to pick up points against everybody.”
Jack Whatmough and Brandon Haunstrup are both available for selection after coming through an in-house training match unscathed.
Jackett said: “The pitch was very heavy, but that’s good for them and will certainly help their fitness. They’re both fine.
“We’ll obviously treat heir injuries with respect, but we’re pleased with their progress and they’re now fit to play.”