Andy Awford insists it is too early to gauge the full extent of the damage to Jack Whatmough’s knee ligaments.
The teenage defender is to miss the rest of the campaign with the injury he sustained in a challenge with Shaun Harrad late on against Cheltenham Town on Tuesday.
Whatmough has already had a scan on his damaged left knee, with another scheduled once the current swelling has subsided.
The Gosport youngster joins Paul Robinson on the sidelines, forcing Awford to yesterday delve into the loan market to recruit defensive duo Nyron Nosworthy and Cole Kpekawa.
Wes Fogden returned last month having been out since July with knee ligament damage picked up during pre-season training.
Whatmough will miss the remaining nine games of Pompey’s season, although Awford is awaiting a report on the precise damage to his knee.
‘There is ligament damage and we will assess it in the next few days. Jack will go back in again for another scan once the swelling has gone down,’ said Awford.
‘We don’t know if it’s as bad as Foggy’s, it’s too early to tell at the minute.
‘We can’t rule it out and can’t say it is definitely the case either.
‘There is going to have to be a bit more scanning done and a bit more research carried out to see what it is.
We don’t know if it’s as bad as Foggy’s, it’s too early to tell at the minuteAndy Awford
‘It looked innocuous when it happened, it’s not like we can plan for that.
‘If he had picked up three hamstrings, for instance, you would be looking at a training load and questioning whether the games affected it.
‘Robbo’s broken cheekbone could have happened in a reserve game, they are accidents, there is no planning that can go into stopping those injuries.’
Meanwhile, Andy Barcham’s knee injury is not as bad as first feared.
Regardless, the wing-back faces a battle to declare himself fit for tomorrow’s trip to AFC Wimbledon, but Josh Passley is available.
Danny East is also vying for the right wing-back spot having played the second half against Cheltenham.
Awford added: ‘Barcham was more of a whack, an impact injury, we are hoping he can recover.
‘He did really well in the first half, with the first goal especially, and looked a big threat down that right-hand side.
‘I am disappointed he had to come off.
‘I thought Danny came in and looked solid and full of energy, while Josh is fine and back training with the squad.’