Phil Brown felt his side should have come away from Fratton Park with all three points.
His Preston team took a 32nd-minute lead through Iain Hume, before Greg Halford’s second-half header ensured Pompey bagged a point.
But despite the Lilywhites fighting for their lives down at the bottom of the Championship and the Blues bidding for the play-offs – before Saturday, anyway – Brown was left to rue poor defending from his men, which he felt led to two points being dropped.
He said: ‘I’m disappointed, to tell you the truth.
‘I thought we were worthy of coming in at half-time 1-0 up.
‘But sloppy defending for the goal and free headers in the six-yard box are things I don’t advocate at all.
‘We’ve been done on detail, not good play.
‘That’s the reason we’re not sitting here talking about three points, as opposed to one.’
On his side’s survival chances, Brown added: ‘It’s only as difficult as you make it. As far as I’m concerned, we showed enough promise to get something from this game, albeit only one point.
‘We were looking for three, but we have to go to Doncaster and make sure we get three on Tuesday.
‘Then we’ve got three out of the last five games at home. It’s still in our hands now.
‘Obviously, when it comes to the mathematics of it, it will be in someone else’s hands come the end of the season.
‘If we’ve got one game to go and we’ve got to win that game to stay in the Championship, I’ll take that now.’