Pompey possess one of the better defensive records in League One, but have not been so prolific at the other end of the pitch.
And Ryan Williams knows that the Blues’ attacking players have to start contributing more goals to the cause.
The winger has enjoyed a run in the team after suffering an injury-hit opening to his second spell at Fratton Park.
Now he is looking to help fire Pompey up the table and build on some recent encouraging performances.
Williams said: “I’ve made three consecutive starts and am feeling good on a personal note, although results haven’t really been going our way.
“Things don’t always go to plan – especially in football – but I’m still confident and we have been playing better in the past few games.
"We – myself included – have to do more to get ourselves and the other players in that front four on the scoresheet."
“Teams always show up against Pompey and have something up their sleeve because we’re a bit of a scalp.
“I think we just have to keep doing what we’ve been doing, but put more of our chances away. We’re on the right path.
“We – myself included – have to do more to get ourselves and the other players in that front four on the scoresheet.
“The chemistry is getting there and the more time we spend together on the pitch, the better we’ll get.”
Williams spent the 2013/14 campaign on loan at Saturday’s opponents Oxford, scoring eight goals in 42 appearances.
He said: “I had one of the most enjoyable times of my career at Oxford. It was my first taste of a full season in men’s football and I loved it.
“They’re up there with the highest scorers in the league, so we have to try to keep a clean sheet and then work off that.
“You can’t just go out and look to win 3-0 or 4-0, although that’s what you hope for. We’ll be cautious, but confident at the weekend.”