Brendan Rodgers has warned Pompey’s pride can wreck Swansea’s promotion plans.
The Swans are currently in fifth spot in the Championship – five points off Welsh rivals Cardiff in second.
They have been undone of late by a run of four successive defeats away from the Liberty Stadium.
Tomorrow they visit Fratton Park to take on a Blues side whose season is effectively over with promotion out of reach and the club safe from relegation.
Rodgers does not expect an easy ride, though.
And Swansea’s boss remains fearful of the threat Steve Cotterill’s men pose.
Rodgers said: ‘Whatever position the team is, every professional player will play for pride.
‘Portsmouth lost their last home game 3-0, so they will want to put that behind them.
‘And they also have the chance to do the double over a team who are up there challenging in the table, which will be a motivation for them.
‘We felt as a group we would need five more wins and the great thing for us is that we can still achieve that target.
‘We got one win against Norwich and – with four games ahead of us – we can still get to where we wanted to be.
‘We wanted to get our points tally into the low 80s and that is achievable.
‘If we do that and it’s still not enough, then we can say we have given it our best shot.
‘We are focused on what we have to do in the next four games.’