Pompey have enjoyed an upturn in fortunes in the past fortnight.
A run of four successive defeats had halted their climb up the table and ensured an early exit from the FA Cup.
But a Checkatrade Trophy win at Charlton was followed by successive league victories over Blackpool and Southend.
Kenny Jackett does not believe that is down to a huge improvement in performance levels, but simply more chances being taken.
The Blues boss said: “There were a number of those defeats where we could have got results.
“We created quite a few chances but, as ever, if you don’t put them away then you can’t complain about that.
"Finishing is such an important part of the game – and at the moment we’ve got someone who can do that."
“There have been a lot of very tight games that could have gone either way, but the bottom line is the result.
“Finishing is such an important part of the game – and at the moment we’ve got someone who can do that and make a real difference.
“The side is set up for Brett Pitman and his strengths because you have to use your assets, although would I like more goals to come from other areas? Yes, I would.”
Pompey will look to extend their winning run when they visit 11th-placed Peterborough on Tuesday evening.
Jackett said: “They are one of many teams who are chasing those top places and are in a good position to do so, as we are.
“Peterborough started off like a house on fire, but this is a tough division and there’s a lot of quality in the top half.
“I remember when they went down from the Championship with 54 points a few years ago and they’re always one of the teams in League One who are playing the best football.
“We’re not underestimating how hard it’s going to be, but a win has to be our aim. It’s a big week for us and we want a good total from the nine points that are available.
“Nobody’s going to give us that, however, and we have to work hard for every single one that we get.”