Pompey will continue to cast their eye over Theo Robinson as Paul Cook seeks to recruit a third striker.
The former Derby County man played 41 minutes in the Blues’ 1-1 draw at the Hawks on Saturday.
We will keep Theo with us, I think he has got to get fitter, you could see him blowing a little bit and late on we took him and Conor (Chaplin) off to give the lads on the bench a run outPaul Cook
He was part of an improved second-half display from the visitors, serving as the lone striker in a 4-2-3-1 system.
Cook already has Matt Tubbs and Jayden Stockley on his books in terms of strikers, the duo partnering each other in the first half.
Yet the Blues are still searching for another addition in that area of the squad.
And Robinson, who netted three goals in eight games on loan at Scunthorpe at the end of last season, remains in the frame.
Cook said: ‘I thought Theo was excellent. What he does is give you a buzz at the top end of the pitch where the first thing he does is close the man down.
‘He gives you energy and life and had a couple of great chances. He has got to work on that but has a great goalscoring record.
‘I do feel we need to bring in someone else at the top end of the pitch.
‘In Stockley we have a physicality and a bit of movement and pace, which is something to work with.
‘In Tubbs we have a proven goalscorer, which is a great quality to have – and I think we need one more to supplement them.
‘Theo started training with us last week and is training really well.
‘We will keep him with us, I think he has got to get fitter, you could see him blowing a little bit and late on we took him and Conor (Chaplin) off to give the lads on the bench a run out.’
Robinson, who was one of six triallists against the Hawks, has the distinction of playing in all of the top four English divisions.
He made one appearance for Watford in the Premier League, coming as a substitute in a 1-1 draw at Newcastle in May 2007.
The 26-year-old once scored 16 goals in 52 appearances for Hereford United during a season-long loan spell in League Two.
He also netted 16 times for Huddersfield Town during their 2009-10 League One campaign.
In addition, Robinson registered 12 goals in 41 appearances for Derby in the Championship in 2011-12.
This summer he became a free agent when he was released by Doncaster Rovers after nine goals in 72 games.
And Cook is keeping the striker in mind as seeks to add to a squad which already has nine newcomers for the season ahead.
He added: ‘We are just working away, continuing to talk to people.
‘If you were to sign somebody then it might be we can’t sign somebody else, so we are looking at everything.
‘What we have got to do is keep everyone talking, keep the frequencies open and we will go for what we think is best for the club.’