Pompey are waiting to learn if their injury woes have worsened after Paul McCallum limped out of reserve-team action.
The striker netted his fifth goal in three second-string league games during yesterday’s 5-2 defeat at Luton.
There have been a few injuries of late and we have got to be a bit waryPaul Hardyman
However, he did not reappear after the break after being forced off with an ankle injury.
Paul Hardyman revealed the substitution was carried out as a precaution, with the Blues now awaiting news on the full extent of any potential damage.
Jack Whatmough (knee), Paul Robinson (cheekbone), Andy Barcham (knee), Michael Poke (back) and Danny East (hamstring) are already on the sidelines following a flurry of recent injuries.
And Pompey’s reserve-team boss is hoping McCallum does not join them.
Hardyman said: ‘Paul injured his ankle, he got raked down his Achilles and then jumped and landed awkwardly.
‘He’s got a little bit of a tweak on his ankle, I don’t think it is anything massive.
‘He jumped up like Lazarus afterwards so we took him off as a precaution.
‘There have been a few injuries of late and we have got to be a bit wary.
‘There are a lot of games coming up and that is why we took Paul off at half-time, as a precaution more than anything else.‘
McCallum and Craig Westcarr gave the reserves a 2-0 half-time lead at Kenilworth Road yesterday.
However, the Final Third Development League leaders stormed back in the second-half, netting five times to all but end Blues hopes of beating them to the title.
McCallum, who is on loan for the rest of the season from West Ham, has made five first-team appearances.