It has been an inconsistent start to the season for Pompey.
They have yet to string together successive victories, with all three of their league successes so far being followed by a defeat.
Kenny Jackett is confident that can change, but knows that actions on the pitch will speak louder than any words.
And he hopes that Pompey can take advantage of successive home games against Bristol Rovers and Oldham.
The Blues boss said: “We feel capable of going on a winning run, but saying you’re close isn’t good enough – you actually have to go and do it.
“There wasn’t enough energy at Scunthorpe on Saturday and we didn’t have any purpose going forward. We didn’t do enough with the ball.
"We want to be a force in this division and as the home side, we have to make sure they worry about us."
“Bristol Rovers were seventh in the league last season and will want to go one better this time and get a top six berth.
“I’m sure they’ll be eyeing up the Championship like we all are and will have aspirations of getting there.
“They have a big squad and a lot of quality, but while we respect every opponent, it’s up to us to find our rhythm.
“We want to be a force in this division and as the home side, we have to make sure they worry about us.
“There was a positive atmosphere in our last game at Fratton Park, so hopefully we can get Saturday out of our system.
“We’ve got two home matches coming up in the space of a few days, so we have to look at that as an opportunity.”
Jackett will have to decide whether strikers Conor Chaplin and Brett Pitman feature against the Pirates, with the duo both carrying knocks.
He said: “There will be a few late fitness tests and we’ll have to see whether Damien McCrory is okay to return from his knee injury.
“Conor has a very slight hamstring strain, while Brett’s knee troubled him a bit on Saturday, so we’ll make a decision on those three on Tuesday morning.
“But if there are opportunities for other players to come in, then hopefully they’ll be able to take them.”