Pompey have been steadily climbing the League One table in recent weeks to close in on the play-off spots.
But the focus switches to FA Cup progress this weekend, with National League North outfit Altrincham visiting the south coast.
Kenny Jackett is looking for another run in the competition after guiding his side to the fourth round last season.
And he has urged his troops to maintain their high standards rather than worry about the threat of an upset.
The Blues boss said: “It’s important you don’t overestimate or underestimate any opposition, while realising you have to set your own standards.
“The team you’re playing against will obviously have an effect, but you need to take ownership of your own performance.
“It might be a little bit more low-key than Rotherham on Tuesday or Peterborough the following Saturday.
"We know a lot about Altrincham and I’ve got friends who work in that league and have played them recently."
“But that doesn’t matter. It’s something we have to overcome and make sure that we get the crowd on board.
“We know a lot about Altrincham and I’ve got friends who work in that league and have played them recently. We’ve done our due diligence.
“There were some big FA Cup games last season – and the highlight was beating Norwich away with a late goal – and we want to get through to third round.
“We won’t be messing with the team too much. I might feel that someone needs a break, but I don’t want the rhythm to change for the sake of it.”
Pompey go into Saturday’s contest having suffered just one defeat in their past 12 fixtures in all competitions.
Jackett said: “Recent results and performances have encouraged everyone and it means our season is ahead of us and that’s an exciting prospect.
“You look at the table and we’re within touching distance of the top six, but what matters now is what we do moving forward.
“We’ve put ourselves in a position that gives us a real chance, but we want to keep raising the bar and identifying what we need to do to improve.”