Patrick Agyemang fired Pompey’s cup charge past Oxford and declared: I knew I could light up the game.
Agyemang changed the match with his second-half introduction sparking the 2-1 win at the Kassam Stadium.
The thriving hitman and John Marquis got the goals which saw Guy Whittingham’s side into the third round of the competition for the first time.
Pompey could count themselves lucky to go in level at the break against the side who beat them 4-1 on the opening day of the season.
But an improved second-half performance was ignited by Aygemang’s 59th-minute introduction.
It took the 33-year-old six minutes to deliver an outstanding opener with a 20-yard curling effort with the outside of his boot.
Agyemang vowed he always felt he could enter the fray and make an impact against the Us.
His burgeoning confidence since arriving at Fratton Park in the summer has given him the belief he can impact any game.
The ex-Wimbledon striker said: ‘We couldn’t get anything going in the first half.
‘The manager told me to be ready for a cameo role – and I was ready for that.
‘Guy thought I could come on and change the game and luckily I did.
‘John is a young player. To be playing up there on your own is hard for any player.
‘In the end I came on to share the load with him and it worked.
‘John got his reward for all his work and I got my goal.
‘I was pleased with it. That one was up there.
‘I came on thinking I could do something.
‘I felt really relaxed and it showed when I took my goal.
‘The game was there to be lit up.
‘I’m in a good place at the moment.
‘I love playing at this club and the boys are excellent.’
The win over an Oxford side flying high in the league sends Pompey into Saturday’s third-round draw.
It also gives the Blues their first back-to-back wins of the season, as they begin to find the consistency they’ve been searching for.
Agyemang feels the past two results can now be a catalyst for a surge up the League Two table.
Pompey will look to continue that form as they go to Plymouth Argyle in Saturday’s televised dockyard derby clash.
Agyemang said: ‘We can push our way up now.
‘The football we have played has not warranted where we are.
‘We have had silly mistakes and sendings offs.
‘But we have got two wins on the bounce and I feel we can really push on in the league now.’