Matt Clarke is hoping that Pompey can close the gap on the three sides above them in the League One standings.
But he also knows that three points are required at Charlton on Saturday to extend the gap between them and the chasing pack.
Their opponents currently sit fifth in the standings – one place and five points behind the Blues with 11 games remaining.
Sky Sports cameras will be there to capture the action at The Valley and Clarke wants Pompey to show their promotion credentials.
The defender said: “Charlton are doing well and currently in the play-off positions with us, so we want to do well and try to build more of a gap.
“If we win on Saturday then we can start looking up, rather than who’s behind us. We don’t want to worry about those teams catching us.
"Everyone at the club is aspiring to be in the Championship and you always want to test yourself at the highest level."
“There are so many points still to play for and we’re just focusing on the next game, ticking them off as they come.
“To get the win at Fratton Park last week – and in the way we achieved it – gave everyone a bit of a lift.
“Everyone at the club is aspiring to be in the Championship and you always want to test yourself at the highest level.”
Clarke is available for selection against Charlton, despite being involved in a nasty clash of heads with Nathan Thompson against Bradford last weekend.
He said: “It was just one of those things and I went to the hospital after the game to get it sorted out.
“I’ve been given some tablets and some oil and to be fair, it’s healing quite well, so I’ll be fine for Saturday.
“The x-ray showed a bit of Nathan’s tooth and they had to dig around, but did find it in the end. It was just a tiny little fragment.”
Pompey are heading to Wembley at the end of March to face Sunderland in the final of the Checkatrade Trophy.
Clarke said: “It’s probably what the competition organisers wanted because it’s two massive clubs with big fan-bases.
“The day is something we can all look forward to and when you play at Wembley, you want it to be full and noisy.”