Lee Bradbury has plenty to think about after the Hawks conceded four second-half goals against Pompey at Westleigh Park.
The home side worked hard but were guilty of gifting their professional neighbours three of their goals.
In addition, the Hawks lost three key players through injury which is a worry for Bradbury.
New-boys JJ Hooper and Brian Dutton departed in the first half followed by Dan Strugnell after the break.
Bradbury is hoping he can get all three back sooner rather than later.
‘It was a useful but costly exercise and shows we still have a bit to do,’ he said.
‘At the same time we have to be realistic because Portsmouth are a good side who I think will be in the top six of League Two this season.
‘The most disappointing aspect was our poor decision making which gifted them at least two goals.
‘We were guilty of getting caught trying to play the ball out from the back.
‘You just can’t afford to allow your opponents those opportunities.
‘If you are going to do it, though, these are the type of games you want to be doing it in.
‘You don’t want to be doing the same come the start of the league season.’
Young striker Hooper lasted less than two minutes before limping off with a hamstring strain.
Dutton didn’t last much longer – hobbling off with a calf injury on 14 minutes.
The Hawks were forced to reorganise with Pedro Monteiro and Spanish triallist Serge Valeran coming on.
Bradbury was still able to take a number of positives from the game though.
Keeper Ryan Young looked a superb acquisition, commanding his area and organising the defence.
Defender and captain Ryan Woodford carried on where he left off at the end of last season, giving nothing away at the back.
In the second half, Bradbury sent on new winger Ben Swallow and he showed glimpses of what an exciting prospect he is.
He was happy to run at the Pompey defenders and gave them a few problems.
The Hawks continue their preparations by hosting a West Ham United under-21 side at Westleigh Park tomorrow (7.45pm).