Pompey are targeting a new defender in time for the visit of Walsall on Saturday.
Gabor Gyepes has been officially ruled out for three weeks after picking up an injury on his debut at Crawley.
A scan yesterday revealed the Hungarian defender damaged ligaments in his left ankle, effectively sidelining him for at least the next six matches.
That once again leaves the Blues light on defensive numbers – a problem area which saw the former Cardiff man signed in the first place last week.
Pompey’s head of sports performance, Steve Allen, said: ‘We’ve had the scan results back for Gabor and he’s damaged his ankle ligaments.
‘We are looking at him being out for three weeks. Otherwise, it’s not looking too bad in terms of the first-team squad.’
The return of injured Paul Connolly to Leeds now creates a loan spot for Michael Appleton to utilise.
Ruled out for up to four weeks with a groin problem, his loan can be cancelled after 28 days and he has gone back to his parent club.
For Appleton, the result is his squad is now back down to 19 – allowing him to bring in another player before Saturday’s clash with Walsall.
And it will be a defender which will get the Blues boss’ nod, as he once again puts the need to sign a striker on hold.
Clearly competition for Izale McLeod and Luke Rodgers is an area Appleton needs to work on, yet once again the priority of a defender has popped up.
The likelihood is that will be a loan player, to join Mikkel Andersen, Kevin Long, Jordan Obita and Conor Clifford.
However, it is understood Hermann Hreidarsson is not under consideration.