Jade Bradley joined Pompey Women over the summer from their next opponents.
The midfielder spent the second half of last season with QPR, who visit the PMC Stadium on Sunday (2pm kick-off).
Joining the Londoners provided the opportunity for more regular first team football after leaving Reading.
But QPR struggled in the league last term, with only Swindon – who ended without a point – finishing below them in the table.
Bradley said: “It was a great way for me to get back into playing again after a number of long-term injuries.
“The team had so much quality, but we struggled to gel together and that’s what cost us some big losses throughout the season.”
"We have a well-structured set-up here at Pompey. It’s a professional environment which pushes us to be better."
Before swapping the capital for the south coast, Bradley took to the Fratton turf in a 6-1 defeat against Pompey on the final day of the 2017/18 campaign.
She said: “The game was a big one for us. It was the last chance to prove ourselves, but unfortunately it didn’t work out that way.
“Portsmouth played well – one, two-touch football – and exploited our weaknesses. QPR look to set up pressing high and try to win the ball back from the top of the pitch.
“It did work at times during the match, but Pompey played well and scored six goals on the counter.
“Since joining in the summer, I noticed a big difference in my fitness and tactical understanding. I’m young and have a lot to learn, but both the management and my team-mates have helped catalyse my learning already in half a season.
“We have a well-structured set-up here at Pompey. It’s a professional environment which pushes us to be better.
“Looking ahead to Sunday’s game against QPR, we need to start where we left off, but with more goals.
“Our passing and movement have been second to none and now we just need to finish our chances. If we play with determination and character I'm sure we will come away with success.”