Pompey powerhouse Marko Futacs is gunning to make a streamlined assault on the Championship.
The 6ft 5in hitman has been told by Steve Cotterill to lose some of his bulk to make him a more mobile threat to defences.
Futacs opened his Blues account on Wednesday with the opening goal in the 2-0 friendly win over FC Rostov.
The 21-year-old has been doing his best to make his mark in training following his arrival on a free transfer in August, after being released from German side Werder Bremen.
Having been limited to cameo displays coming off the bench in league matches for the Blues, he is hoping his hard work will pay off.
Futacs would be willing to go out on loan if Pompey manager Cotterill believes that will help his progress.
But the Hungarian under-21 international, who got 90 minutes under his belt in the charity game against Russian side Rostov, insists his prime aim is to make it as attacking terror at Pompey.
Futacs said: ‘The ambition is to play more and more.
‘I think in training I have to give my all. This is the first step.
‘The first thing the manager told me was that I had to lose some weight.
‘Not too much – but I have to lose some.
‘I’ve lost one to one-and-a-half kilogrammes, and I already feel different. My body is moving in a different way.
‘It’s what I need. My big body needs to be quicker.
‘The manager knows this, too, because he’s a really good coach. This is the first thing he has noticed.
‘I am already feeling better, too. I feel better in training.
‘If I keep going in this way it will be really good for me.
‘If I get my chance I will have to do my best to take it.
‘I do everything to progress. If the gaffer says to me I have to go somewhere to play games, I will do.
‘My ambition one day is to play at Portsmouth every week.
‘If the gaffer thinks I need to play somewhere to help that then we will see.’
Futacs knows he needs to adapt his game to the rigours of the Championship after spells playing in France, Germany and his native Hungary.
He accepts he needs to work on his heading to make the most of his obvious physical attributes.
Futacs said: ‘I have to practice my heading and keeping the ball.
‘I’ve played in Germany and it’s really different.
‘In one game I would get two or three balls to my head.
‘In England, every second ball is to the head.
‘But that’s okay. I’m here to work and learn and I’m already feeling better.’